Sweeney was both the men's and women's volleyball coach at East Stroudsburg University before retiring in 1994. He posted a 381-224 record on the men's side and a 383-199 career mark as a women's coach. His women's teams won four Pennsylvania State Athletic Conference Championships. Aside from his coaching success, Sweeney made a positive impact on the sport through his leadership in several organizations.
As president and treasurer of the Eastern Intercollegiate Volleyball Association (EIVA), Sweeney was a key factor in the expansion of men's volleyball on the east coast. It was under his leadership that the organization grew significantly and modified its structure several times to help both varsity and club teams to develop and support volleyball at their respective institutions.
In addition to his work with the EIVA, Sweeney has been active in numerous committees. He served two terms as the eastern representative to the NCAA Men's Volleyball National Committee from 1988-1994. He was chairperson of the NCAA Division II Atlantic Region Selection Committee from 1983-1989. He was an NCAA Representative to USA Volleyball's National Rules Committee from 1990-1993. He also worked on the AVCA Men's Committee from 1991-1994.
Sweeney received the EIVA Leadership and Service Award in 1994. He was inducted into the Pennsylvania Volleyball Coaches Hall of Fame in 1995 and the East Stroudsburg University Hall of Fame in 1996.