diff --git a/apps/client/src/scenes/game/application/GameLoop.ts b/apps/client/src/scenes/game/application/GameLoop.ts
index 8973ac4..1e23d4e 100644
--- a/apps/client/src/scenes/game/application/GameLoop.ts
+++ b/apps/client/src/scenes/game/application/GameLoop.ts
@@ -13,6 +13,7 @@
 import { CameraStep } from "./loopSteps/CameraStep";
 import { BombStep } from "./loopSteps/BombStep";
 import { resolveFrameDelta } from "./loopSteps/frameDelta";
+import { SocketPlayerMoveSender } from "./network/PlayerMoveSender";
 
 type GameLoopOptions = {
   app: Application;
@@ -40,7 +41,9 @@
     this.players = players;
     this.myId = myId;
     this.inputStep = new InputStep({ getJoystickInput });
-    this.simulationStep = new SimulationStep();
+    this.simulationStep = new SimulationStep({
+      moveSender: new SocketPlayerMoveSender(),
+    });
     this.bombStep = new BombStep({ bombManager });
     this.cameraStep = new CameraStep();
   }
diff --git a/apps/client/src/scenes/game/application/loopSteps/SimulationStep.ts b/apps/client/src/scenes/game/application/loopSteps/SimulationStep.ts
index 750a396..92b13b3 100644
--- a/apps/client/src/scenes/game/application/loopSteps/SimulationStep.ts
+++ b/apps/client/src/scenes/game/application/loopSteps/SimulationStep.ts
@@ -4,10 +4,16 @@
  * ローカル更新とリモート補間更新を順に実行する
  */
 import { config } from "@client/config";
-import { socketManager } from "@client/network/SocketManager";
 import { LocalPlayerController, RemotePlayerController } from "@client/scenes/game/entities/player/PlayerController";
+import type { MoveSender } from "@client/scenes/game/application/network/PlayerMoveSender";
 import type { GamePlayers } from "../game.types";
 
+/** SimulationStep の初期化入力 */
+type SimulationStepOptions = {
+  moveSender: MoveSender;
+  nowMsProvider?: () => number;
+};
+
 type SimulationStepParams = {
   me: LocalPlayerController;
   players: GamePlayers;
@@ -17,9 +23,16 @@
 
 /** シミュレーション段の更新処理を担うステップ */
 export class SimulationStep {
+  private readonly moveSender: MoveSender;
+  private readonly nowMsProvider: () => number;
   private lastPositionSentTime = 0;
   private wasMoving = false;
 
+  constructor({ moveSender, nowMsProvider = () => performance.now() }: SimulationStepOptions) {
+    this.moveSender = moveSender;
+    this.nowMsProvider = nowMsProvider;
+  }
+
   public run({ me, players, deltaSeconds, isMoving }: SimulationStepParams) {
     this.runLocalSimulation({ me, isMoving });
     this.runRemoteSimulation({ players, deltaSeconds });
@@ -29,16 +42,16 @@
     if (isMoving) {
       me.tick();
 
-      const now = performance.now();
+      const now = this.nowMsProvider();
       if (now - this.lastPositionSentTime >= config.GAME_CONFIG.PLAYER_POSITION_UPDATE_MS) {
         const position = me.getPosition();
-        socketManager.game.sendMove(position.x, position.y);
+        this.moveSender.sendMove(position.x, position.y);
         this.lastPositionSentTime = now;
       }
     } else if (this.wasMoving) {
       me.tick();
       const position = me.getPosition();
-      socketManager.game.sendMove(position.x, position.y);
+      this.moveSender.sendMove(position.x, position.y);
     } else {
       me.tick();
     }
diff --git a/apps/client/src/scenes/game/application/network/PlayerMoveSender.ts b/apps/client/src/scenes/game/application/network/PlayerMoveSender.ts
new file mode 100644
index 0000000..9efa0c6
--- /dev/null
+++ b/apps/client/src/scenes/game/application/network/PlayerMoveSender.ts
@@ -0,0 +1,19 @@
+/**
+ * PlayerMoveSender
+ * ローカルプレイヤー移動の送信責務を提供する
+ * シミュレーション層から通信実装を分離する
+ */
+import { socketManager } from "@client/network/SocketManager";
+
+/** 移動送信のインターフェース型 */
+export type MoveSender = {
+  sendMove: (x: number, y: number) => void;
+};
+
+/** ソケット経由で移動送信を行う実装 */
+export class SocketPlayerMoveSender implements MoveSender {
+  /** 指定座標をサーバーへ送信する */
+  public sendMove(x: number, y: number): void {
+    socketManager.game.sendMove(x, y);
+  }
+}
\ No newline at end of file