EditorSceneManager.MoveSceneAfter

public static void MoveSceneAfter (SceneManagement.Scene src, SceneManagement.Scene dst);

파라미터

src	The Scene to move.
dst	The Scene which the source Scene should come after in the hierarchy.

Allows you to reorder the Scenes currently open in the Hierarchy window. Moves the source Scene so it comes after the destination Scene.