The American Pie actor, 33, will play a lawyer who is represented by Lockhart & Gardner when he's sued for refusing to release the name of one of his clients, according to TVLine, which first reported the casting. No airdate has been set for the episode.
Biggs was last seen on CBS' short-lived comedy Mad Love, which was canceled after one season last spring. He will next star in the latest American Pie sequel, American Reunion, which hits theaters in April.
The Good Wife airs Sundays at 9/8c on CBS.