diff --git a/apps/client/src/scenes/game/entities/map/GameMapController.ts b/apps/client/src/scenes/game/entities/map/GameMapController.ts
index 9faa689..ff0f999 100644
--- a/apps/client/src/scenes/game/entities/map/GameMapController.ts
+++ b/apps/client/src/scenes/game/entities/map/GameMapController.ts
@@ -30,13 +30,13 @@
   }
 
   /** 全体マップ状態を反映する */
-  public updateMapState(state: domain.gridMap.MapState): void {
+  public updateMapState(state: domain.game.gridMap.MapState): void {
     this.model.applyMapState(state);
     this.view.renderAll(this.resolveAllCellColors(this.model.getAllTeamIds()));
   }
 
   /** 差分セル更新を反映する */
-  public updateCells(updates: domain.gridMap.CellUpdate[]): void {
+  public updateCells(updates: domain.game.gridMap.CellUpdate[]): void {
     this.model.applyUpdates(updates);
 
     updates.forEach(({ index }) => {
diff --git a/apps/client/src/scenes/game/entities/map/GameMapModel.ts b/apps/client/src/scenes/game/entities/map/GameMapModel.ts
index 2b1dd3d..c9ad37c 100644
--- a/apps/client/src/scenes/game/entities/map/GameMapModel.ts
+++ b/apps/client/src/scenes/game/entities/map/GameMapModel.ts
@@ -17,7 +17,7 @@
   }
 
   /** 全体マップ状態を適用する */
-  public applyMapState(state: domain.gridMap.MapState): void {
+  public applyMapState(state: domain.game.gridMap.MapState): void {
     const maxLength = Math.min(
       this.cellTeamIds.length,
       state.gridColors.length,
@@ -28,7 +28,7 @@
   }
 
   /** 差分セル更新を適用する */
-  public applyUpdates(updates: domain.gridMap.CellUpdate[]): void {
+  public applyUpdates(updates: domain.game.gridMap.CellUpdate[]): void {
     updates.forEach(({ index, teamId }) => {
       if (!this.isValidIndex(index)) return;
       this.cellTeamIds[index] = teamId;
diff --git a/apps/client/src/scenes/game/entities/player/PlayerController.ts b/apps/client/src/scenes/game/entities/player/PlayerController.ts
index fa4467c..470f039 100644
--- a/apps/client/src/scenes/game/entities/player/PlayerController.ts
+++ b/apps/client/src/scenes/game/entities/player/PlayerController.ts
@@ -18,7 +18,7 @@
 };
 
 /** リモート移動更新を表す型 */
-export type RemoteUpdate = Partial<domain.player.MovePayload>;
+export type RemoteUpdate = Partial<domain.game.player.MovePayload>;
 
 /**
  * ローカル用コントローラーとリモート用コントローラーの共通基底
@@ -30,7 +30,7 @@
 
   /** 共通初期化としてModelとViewを生成する */
   protected constructor(
-    data: domain.player.PlayerData,
+    data: domain.game.player.PlayerData,
     isLocal: boolean,
     appearanceResolver: AppearanceResolver,
   ) {
@@ -57,12 +57,12 @@
   }
 
   /** 現在座標を取得する */
-  public getPosition(): domain.player.MovePayload {
+  public getPosition(): domain.game.player.MovePayload {
     return this.model.getPosition();
   }
 
   /** 外部送信用スナップショットを取得する */
-  public getSnapshot(): domain.player.PlayerData {
+  public getSnapshot(): domain.game.player.PlayerData {
     return this.model.getSnapshot();
   }
 
@@ -82,7 +82,7 @@
 export class LocalPlayerController extends BasePlayerController {
   /** ローカルプレイヤー用コントローラーを初期化する */
   constructor(
-    data: domain.player.PlayerData,
+    data: domain.game.player.PlayerData,
     appearanceResolver: AppearanceResolver,
   ) {
     super(data, true, appearanceResolver);
@@ -104,7 +104,7 @@
 export class RemotePlayerController extends BasePlayerController {
   /** リモートプレイヤー用コントローラーを初期化する */
   constructor(
-    data: domain.player.PlayerData,
+    data: domain.game.player.PlayerData,
     appearanceResolver: AppearanceResolver,
   ) {
     super(data, false, appearanceResolver);
diff --git a/apps/client/src/scenes/game/entities/player/PlayerModel.ts b/apps/client/src/scenes/game/entities/player/PlayerModel.ts
index 630f248..1825f8d 100644
--- a/apps/client/src/scenes/game/entities/player/PlayerModel.ts
+++ b/apps/client/src/scenes/game/entities/player/PlayerModel.ts
@@ -18,7 +18,7 @@
   private targetGridY: number;
 
   /** 共有プレイヤー情報から初期状態を構築する */
-  constructor(data: domain.player.PlayerData) {
+  constructor(data: domain.game.player.PlayerData) {
     this.id = data.id;
     this.name = data.name;
     this.teamId = data.teamId;
@@ -29,12 +29,12 @@
   }
 
   /** 現在座標を取得する */
-  public getPosition(): domain.player.MovePayload {
+  public getPosition(): domain.game.player.MovePayload {
     return { x: this.gridX, y: this.gridY };
   }
 
   /** 送信用スナップショットを取得する */
-  public getSnapshot(): domain.player.PlayerData {
+  public getSnapshot(): domain.game.player.PlayerData {
     return {
       id: this.id,
       name: this.name,
@@ -64,7 +64,7 @@
   }
 
   /** リモート更新の目標座標を設定する */
-  public setRemoteTarget(update: Partial<domain.player.MovePayload>): void {
+  public setRemoteTarget(update: Partial<domain.game.player.MovePayload>): void {
     if (update.x !== undefined && this.isFiniteNumber(update.x))
       this.targetGridX = update.x;
     if (update.y !== undefined && this.isFiniteNumber(update.y))
diff --git a/apps/server/src/domains/game/GameManager.ts b/apps/server/src/domains/game/GameManager.ts
index 4b0e499..18a1c95 100644
--- a/apps/server/src/domains/game/GameManager.ts
+++ b/apps/server/src/domains/game/GameManager.ts
@@ -66,7 +66,7 @@
   startRoomSession(
     playerIds: string[],
     playerNamesById: Record<string, string>,
-    onTick: (data: domain.game.TickData) => void,
+    onTick: (data: domain.game.tick.TickData) => void,
     onGameEnd: (payload: GameResultPayload) => void,
     onBotPlaceBomb?: (ownerId: string, payload: PlaceBombPayload) => void,
   ) {
diff --git a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
index 0e247fc..7931dda 100644
--- a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
+++ b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
@@ -23,7 +23,7 @@
   startRoomSession(
     playerIds: string[],
     playerNamesById: Record<string, string>,
-    onTick: (data: domain.game.TickData) => void,
+    onTick: (data: domain.game.tick.TickData) => void,
     onGameEnd: (payload: GameResultPayload) => void,
     onBotPlaceBomb?: (ownerId: string, payload: PlaceBombPayload) => void,
   ): void;
@@ -32,7 +32,7 @@
 
 /** 準備完了ユースケースが利用するゲーム状態参照入力ポート */
 export interface ReadyForGamePort {
-  getRoomPlayers(): domain.player.PlayerData[];
+  getRoomPlayers(): domain.game.player.PlayerData[];
   getRoomStartTime(): number | undefined;
 }
 
diff --git a/apps/server/src/domains/game/application/services/GameRoomSession.ts b/apps/server/src/domains/game/application/services/GameRoomSession.ts
index cd90ba7..44c1c0b 100644
--- a/apps/server/src/domains/game/application/services/GameRoomSession.ts
+++ b/apps/server/src/domains/game/application/services/GameRoomSession.ts
@@ -57,7 +57,7 @@
 
   public start(
     tickRate: number,
-    onTick: (data: domain.game.TickData) => void,
+    onTick: (data: domain.game.tick.TickData) => void,
     onGameEnd: (payload: GameResultPayload) => void,
     onBotPlaceBomb?: (ownerId: string, payload: PlaceBombPayload) => void,
   ): void {
diff --git a/apps/server/src/domains/game/application/services/GameSessionLifecycleService.ts b/apps/server/src/domains/game/application/services/GameSessionLifecycleService.ts
index 10fcf2e..3bf2800 100644
--- a/apps/server/src/domains/game/application/services/GameSessionLifecycleService.ts
+++ b/apps/server/src/domains/game/application/services/GameSessionLifecycleService.ts
@@ -74,7 +74,7 @@
   public startRoomSession(
     playerIds: string[],
     playerNamesById: Record<string, string>,
-    onTick: (data: domain.game.TickData) => void,
+    onTick: (data: domain.game.tick.TickData) => void,
     onGameEnd: (payload: GameResultPayload) => void,
     onBotPlaceBomb?: (ownerId: string, payload: PlaceBombPayload) => void,
   ) {
diff --git a/apps/server/src/domains/game/application/useCases/movePlayerUseCase.ts b/apps/server/src/domains/game/application/useCases/movePlayerUseCase.ts
index 054fbfe..54bd04f 100644
--- a/apps/server/src/domains/game/application/useCases/movePlayerUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/movePlayerUseCase.ts
@@ -8,7 +8,7 @@
 type MovePlayerUseCaseParams = {
   gameManager: MovePlayerPort;
   playerId: string;
-  move: domain.player.MovePayload;
+  move: domain.game.player.MovePayload;
 };
 
 /** プレイヤー移動入力をゲーム管理へ委譲する */
diff --git a/apps/server/src/domains/game/entities/map/MapStore.ts b/apps/server/src/domains/game/entities/map/MapStore.ts
index 3c9e35b..bf09972 100644
--- a/apps/server/src/domains/game/entities/map/MapStore.ts
+++ b/apps/server/src/domains/game/entities/map/MapStore.ts
@@ -12,7 +12,7 @@
   // 全マスの現在の色（teamId）を保持
   private gridColors: number[];
   // 次回の送信ループで送る差分リスト
-  private pendingUpdates: domain.gridMap.CellUpdate[];
+  private pendingUpdates: domain.game.gridMap.CellUpdate[];
 
   constructor() {
     // 初期状態は -1 (無色) などで初期化
@@ -35,7 +35,7 @@
   /**
     * 溜まっている差分を取得し，キューをクリアする（ループ送信時に使用）
    */
-  public getAndClearUpdates(): domain.gridMap.CellUpdate[] {
+  public getAndClearUpdates(): domain.game.gridMap.CellUpdate[] {
     return drainPendingUpdates(this.pendingUpdates);
   }
 
diff --git a/apps/server/src/domains/game/entities/map/mapPainting.ts b/apps/server/src/domains/game/entities/map/mapPainting.ts
index efb054c..6135b8f 100644
--- a/apps/server/src/domains/game/entities/map/mapPainting.ts
+++ b/apps/server/src/domains/game/entities/map/mapPainting.ts
@@ -6,7 +6,7 @@
 
 type PaintCellParams = {
   gridColors: number[];
-  pendingUpdates: domain.gridMap.CellUpdate[];
+  pendingUpdates: domain.game.gridMap.CellUpdate[];
   index: number;
   teamId: number;
 };
diff --git a/apps/server/src/domains/game/entities/map/mapUpdates.ts b/apps/server/src/domains/game/entities/map/mapUpdates.ts
index 2d56960..77ce63a 100644
--- a/apps/server/src/domains/game/entities/map/mapUpdates.ts
+++ b/apps/server/src/domains/game/entities/map/mapUpdates.ts
@@ -6,8 +6,8 @@
 
 /** 差分キューを配列として返却し，キューを空にする */
 export const drainPendingUpdates = (
-  pendingUpdates: domain.gridMap.CellUpdate[]
-): domain.gridMap.CellUpdate[] => {
+  pendingUpdates: domain.game.gridMap.CellUpdate[]
+): domain.game.gridMap.CellUpdate[] => {
   const updates = [...pendingUpdates];
   pendingUpdates.length = 0;
   return updates;
diff --git a/apps/server/src/domains/game/entities/player/Player.ts b/apps/server/src/domains/game/entities/player/Player.ts
index 48943b1..2c658c8 100644
--- a/apps/server/src/domains/game/entities/player/Player.ts
+++ b/apps/server/src/domains/game/entities/player/Player.ts
@@ -4,7 +4,7 @@
  */
 import { domain } from "@repo/shared";
 
-export class Player implements domain.player.PlayerData {
+export class Player implements domain.game.player.PlayerData {
   public id: string;
   public name: string;
   public x: number = 0;
diff --git a/apps/server/src/domains/game/entities/player/playerPosition.ts b/apps/server/src/domains/game/entities/player/playerPosition.ts
index 700b0da..316e400 100644
--- a/apps/server/src/domains/game/entities/player/playerPosition.ts
+++ b/apps/server/src/domains/game/entities/player/playerPosition.ts
@@ -7,5 +7,5 @@
 
 /** プレイヤー座標に対応するグリッドインデックスを返す */
 export const getPlayerGridIndex = (player: Player): number | null => {
-  return domain.gridMap.getGridIndexFromPosition(player.x, player.y);
+  return domain.game.gridMap.getGridIndexFromPosition(player.x, player.y);
 };
diff --git a/apps/server/src/domains/game/loop/GameLoop.ts b/apps/server/src/domains/game/loop/GameLoop.ts
index 403867b..9e51f34 100644
--- a/apps/server/src/domains/game/loop/GameLoop.ts
+++ b/apps/server/src/domains/game/loop/GameLoop.ts
@@ -28,7 +28,7 @@
   private endMonotonicTimeMs: number = 0;
   private nextTickAtMs: number = 0;
   private readonly maxCatchUpTicks: number = 3;
-  private lastSentPlayers: Map<string, domain.game.PlayerPositionUpdate> =
+  private lastSentPlayers: Map<string, domain.game.tick.PlayerPositionUpdate> =
     new Map();
   private disconnectedBotControlledPlayerIds: Set<string> = new Set();
   private botTurnOrchestrator: BotTurnOrchestrator =
@@ -39,7 +39,7 @@
     private tickRate: number,
     private players: Map<string, Player>,
     private mapStore: MapStore,
-    private onTick: (data: domain.game.TickData) => void,
+    private onTick: (data: domain.game.tick.TickData) => void,
     private onGameEnd: () => void,
     private onBotPlaceBomb?: (
       ownerId: string,
@@ -178,7 +178,7 @@
     this.disconnectedBotControlledPlayerIds.delete(playerId);
   }
 
-  private buildTickData(): domain.game.TickData {
+  private buildTickData(): domain.game.tick.TickData {
     const activePlayerIds = new Set<string>();
     const playerUpdates = this.collectChangedPlayerUpdates(activePlayerIds);
     this.cleanupInactivePlayerSnapshots(activePlayerIds);
@@ -191,8 +191,8 @@
 
   private collectChangedPlayerUpdates(
     activePlayerIds: Set<string>,
-  ): domain.game.TickData["playerUpdates"] {
-    const changedPlayers: domain.game.TickData["playerUpdates"] = [];
+  ): domain.game.tick.TickData["playerUpdates"] {
+    const changedPlayers: domain.game.tick.TickData["playerUpdates"] = [];
 
     this.players.forEach((player) => {
       activePlayerIds.add(player.id);
@@ -202,7 +202,7 @@
       }
 
       // 送信用のプレイヤーデータを構築
-      const playerData: domain.game.PlayerPositionUpdate = {
+      const playerData: domain.game.tick.PlayerPositionUpdate = {
         id: player.id,
         x: player.x,
         y: player.y,
diff --git a/apps/server/src/network/handlers/game/gameEventOrchestrators.ts b/apps/server/src/network/handlers/game/gameEventOrchestrators.ts
index cffe09a..91b34e9 100644
--- a/apps/server/src/network/handlers/game/gameEventOrchestrators.ts
+++ b/apps/server/src/network/handlers/game/gameEventOrchestrators.ts
@@ -84,7 +84,7 @@
 /** MOVEイベントを調停して移動ユースケースを実行する */
 export const handleMoveEvent = (
   deps: GameEventOrchestratorDeps,
-  move: domain.player.MovePayload,
+  move: domain.game.player.MovePayload,
 ): void => {
   const resolved = runWithRuntimeByPlayerId(
     deps.roomManager,
diff --git a/apps/server/src/network/validation/socketPayloadValidators.ts b/apps/server/src/network/validation/socketPayloadValidators.ts
index 3fbb775..981940b 100644
--- a/apps/server/src/network/validation/socketPayloadValidators.ts
+++ b/apps/server/src/network/validation/socketPayloadValidators.ts
@@ -26,7 +26,7 @@
 /** MOVEイベントのペイロードが移動座標であるか判定する */
 export const isMovePayload = (
   value: unknown,
-): value is domain.player.MovePayload => {
+): value is domain.game.player.MovePayload => {
   if (typeof value !== "object" || value === null) {
     return false;
   }
diff --git a/packages/shared/src/domains/index.ts b/packages/shared/src/domains/index.ts
index 1d8e204..bb788c0 100644
--- a/packages/shared/src/domains/index.ts
+++ b/packages/shared/src/domains/index.ts
@@ -10,8 +10,3 @@
 export * as game from "./game";
 /** room ドメインを再公開する */
 export * as room from "./room";
-
-/** 後方互換: game 配下へ移動した player を旧パスでも公開する */
-export * as player from "./game/player";
-/** 後方互換: game 配下へ移動した gridMap を旧パスでも公開する */
-export * as gridMap from "./game/gridMap";