Inducted as a truly great player, Beroza played lacrosse at Hempstead High School, where he received all-division honors and was selected as the team's MVP in 1973. As a goalie at Roanoke College, he received second team All-American honors in 1977 and honorable mention honors in 1976. As captain his senior year, he led the team to the NCAA Division II-III semifinals, setting an NCAA record of 30 saves in a playoff game. In 1987, he was inducted to the Roanoke College Athletics Hall of Fame.
Bill played for the Long Island-Hofstra Lacrosse Club from 1978-1987, helping them win the club championship six times. He won the Hero's Club Award five times and was named to the Super-Star Lacrosse team three times. Bill was honored All-Club Player of the Year in 1978 and MVP in the 1980 Club Championship game. He was selected co-captain as a player on the 1982 U.S. Team, and he was named an alternate for the 1978 and 1986 U.S. Teams. He coached the LI-Hofstra Club from 1991-1996, earning club coach of the year honors in 1991 and 1994. He was elected to the Long Island Metro Hall of Fame in 1992.