كتب : وكالات
The veteran Frenchman told Germany's ZDF TV that he submitted his request to the board a few weeks ago, without elaborating.
Sagnol, 30, has been sidelined for seven months after undergoing an operation to fix a knee injury.
In October, Sagnol said he is making progress and should be back with the Bavarians soon.
But he made this dramatic U-turn without clear reasons.