diff --git a/apps/server/eslint.config.mjs b/apps/server/eslint.config.mjs
index f2adfcd..e50ff7f 100644
--- a/apps/server/eslint.config.mjs
+++ b/apps/server/eslint.config.mjs
@@ -21,6 +21,29 @@
     },
     rules: {
       'local/prefer-relative-for-local-server-path': 'warn',
+      'no-restricted-imports': [
+        'error',
+        {
+          paths: [
+            {
+              name: 'socket.io',
+              message:
+                'socket.io の import は network 配下のみにしてください。',
+            },
+            {
+              name: 'socket.io-client',
+              message:
+                'socket.io-client の import は network 配下のみにしてください。',
+            },
+          ],
+        },
+      ],
+    },
+  },
+  {
+    files: ['src/network/**/*.ts'],
+    rules: {
+      'no-restricted-imports': 'off',
     },
   },
 ];
\ No newline at end of file
diff --git a/apps/server/src/domains/game/handlers/onDisconnect.ts b/apps/server/src/domains/game/handlers/onDisconnect.ts
deleted file mode 100644
index 579bcec..0000000
--- a/apps/server/src/domains/game/handlers/onDisconnect.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-import { Server } from "socket.io";
-import { GameManager } from "@server/domains/game/GameManager";
-import { disconnectUseCase } from "@server/domains/game/application/useCases/disconnectUseCase";
-import { createEmitToAll } from "@server/network/adapters/socketEmitters";
-
-const getEmitToAll = (io: Server) => createEmitToAll(io);
-
-export const onDisconnect = (
-  io: Server,
-  gameManager: GameManager,
-  playerId: string
-) => {
-  const emitToAll = getEmitToAll(io);
-
-  disconnectUseCase({
-    gameManager,
-    playerId,
-    emitToAll,
-  });
-};
diff --git a/apps/server/src/domains/game/handlers/onMove.ts b/apps/server/src/domains/game/handlers/onMove.ts
deleted file mode 100644
index b07d713..0000000
--- a/apps/server/src/domains/game/handlers/onMove.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import { GameManager } from "@server/domains/game/GameManager";
-import type { playerTypes } from "@repo/shared";
-import { movePlayerUseCase } from "@server/domains/game/application/useCases/movePlayerUseCase";
-
-export const onMove = (
-  gameManager: GameManager,
-  playerId: string,
-  data: playerTypes.MovePayload
-) => {
-  movePlayerUseCase({
-    gameManager,
-    playerId,
-    move: data,
-  });
-};
diff --git a/apps/server/src/domains/game/handlers/onPing.ts b/apps/server/src/domains/game/handlers/onPing.ts
deleted file mode 100644
index e95998d..0000000
--- a/apps/server/src/domains/game/handlers/onPing.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import { Socket } from "socket.io";
-import { pingUseCase } from "@server/domains/game/application/useCases/pingUseCase";
-import { createEmitToSocket } from "@server/network/adapters/socketEmitters";
-
-const getEmitToSocket = (socket: Socket) => createEmitToSocket(socket);
-
-export const onPing = (socket: Socket, clientTime: number) => {
-  const emitToSocket = getEmitToSocket(socket);
-
-  pingUseCase({
-    clientTime,
-    emitToSocket,
-  });
-};
diff --git a/apps/server/src/domains/game/handlers/onReadyForGame.ts b/apps/server/src/domains/game/handlers/onReadyForGame.ts
deleted file mode 100644
index 3f88132..0000000
--- a/apps/server/src/domains/game/handlers/onReadyForGame.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import { Socket } from "socket.io";
-import { GameManager } from "@server/domains/game/GameManager";
-import { readyForGameUseCase } from "@server/domains/game/application/useCases/readyForGameUseCase";
-import { createEmitToSocket } from "@server/network/adapters/socketEmitters";
-
-const getEmitToSocket = (socket: Socket) => createEmitToSocket(socket);
-
-export const onReadyForGame = (
-  socket: Socket,
-  gameManager: GameManager
-) => {
-  const roomId = Array.from(socket.rooms).find((room) => room !== socket.id);
-  const emitToSocket = getEmitToSocket(socket);
-
-  readyForGameUseCase({
-    socketId: socket.id,
-    roomId,
-    gameManager,
-    emitToSocket,
-  });
-};
diff --git a/apps/server/src/domains/game/handlers/onStartGame.ts b/apps/server/src/domains/game/handlers/onStartGame.ts
deleted file mode 100644
index 62efb9e..0000000
--- a/apps/server/src/domains/game/handlers/onStartGame.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import { Server } from "socket.io";
-import { GameManager } from "@server/domains/game/GameManager";
-import { RoomManager } from "@server/domains/room/RoomManager";
-import { startGameUseCase } from "@server/domains/game/application/useCases/startGameUseCase";
-import { createEmitToRoom } from "@server/network/adapters/socketEmitters";
-
-const getEmitToRoom = (io: Server) => createEmitToRoom(io);
-
-export const onStartGame = (
-  io: Server,
-  gameManager: GameManager,
-  roomManager: RoomManager,
-  ownerId: string
-) => {
-  const emitToRoom = getEmitToRoom(io);
-
-  startGameUseCase({
-    ownerId,
-    gameManager,
-    roomManager,
-    emitToRoom,
-  });
-};
diff --git a/apps/server/src/index.ts b/apps/server/src/index.ts
index 55840bf..526da54 100644
--- a/apps/server/src/index.ts
+++ b/apps/server/src/index.ts
@@ -1,8 +1,8 @@
-import { Server } from "socket.io";
 import { createServer } from "http";
 import { GameManager } from "./domains/game/GameManager";
 import { RoomManager } from "./domains/room/RoomManager";
 import { SocketManager } from "./network/SocketManager";
+import { createIo } from "./network/createIo";
 import { config } from "@repo/shared";
 
 // サーバー待受ポート
@@ -20,13 +20,7 @@
   res.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
   res.end("not found");
 });
-const io = new Server(httpServer, {
-  cors: {
-    // 開発環境向け全オリジン許可設定
-    origin: config.NETWORK_CONFIG.CORS_ORIGIN,
-    methods: [...config.NETWORK_CONFIG.CORS_METHODS]
-  },
-});
+const io = createIo(httpServer);
 
 // ゲーム管理・通信管理クラス初期化
 const gameManager = new GameManager();
diff --git a/apps/server/src/network/SocketManager.ts b/apps/server/src/network/SocketManager.ts
index 56ce860..6ab7ad5 100644
--- a/apps/server/src/network/SocketManager.ts
+++ b/apps/server/src/network/SocketManager.ts
@@ -2,8 +2,8 @@
 import { GameManager } from "@server/domains/game/GameManager";
 import { RoomManager } from "@server/domains/room/RoomManager";
 import { protocol } from "@repo/shared";
-import { registerRoomHandlers, handleRoomDisconnect } from "@server/network/handlers/RoomHandler";
-import { registerGameHandlers, handleGameDisconnect } from "@server/network/handlers/GameHandler";
+import { registerRoomHandlers, handleRoomDisconnect } from "./handlers/RoomHandler";
+import { registerGameHandlers, handleGameDisconnect } from "./handlers/GameHandler";
 
 export class SocketManager {
   private io: Server;
diff --git a/apps/server/src/network/createIo.ts b/apps/server/src/network/createIo.ts
new file mode 100644
index 0000000..e77fb86
--- /dev/null
+++ b/apps/server/src/network/createIo.ts
@@ -0,0 +1,12 @@
+import { Server } from "socket.io";
+import { config } from "@repo/shared";
+import type { Server as HttpServer } from "http";
+
+export const createIo = (httpServer: HttpServer) => {
+  return new Server(httpServer, {
+    cors: {
+      origin: config.NETWORK_CONFIG.CORS_ORIGIN,
+      methods: [...config.NETWORK_CONFIG.CORS_METHODS],
+    },
+  });
+};