After retiring as a player, he became a key member of the coaching staff under John Lyall, a period which included the FA Cup Final victories in 1975 against Fulham and against Arsenal in 1980. He subsequently coached under Billy Bonds. Boyce also took charge of West Ham for one game as caretaker manager in February 1990. He was appointed West Ham's chief scout in September 1991, remaining in that position until 1995. He went on to hold coaching roles at Queens Park Rangers and Millwall, before joining Tottenham Hotspur as a scout in 1998.