After graduating from Saint Joseph's, Boyle taught in the parochial school system in the Philadelphia area. In 1971, he was hired as an assistant at
Widener. Boyle joined the staff at Saint Joseph's in 1973. In 1981, he helped the Hawks reach the Elite Eight. On May 21, 1981, Boyle was hired as head coach at Saint Joseph's, replacing his high school teammate Jim Lynam, who left to join the
Portland Trail Blazers organization. In 1985, Boyle hired later Saint Joseph's coach
Phil Martelli to his staff. During the 1985–86 season, Boyle led the team to a 26–6 record,
Atlantic 10 championship, and NCAA Tournament appearance. Boyle announced his resignation from the Hawks on December 22, 1989, effective at the end of the season, and finished with a record of 151–114. In September 1990, Boyle was hired as an assistant coach for the
Denver Nuggets of the NBA. He coached for two seasons under
Paul Westhead. Boyle was fired in May 1992, when new coach
Dan Issel opted not to retain him. ==Personal life and death==