Capuano played high school hockey at the Kent School in Kent, Connecticut and was a 5th round selection (88th overall) in the 1984 NHL Entry Draft. He played his college hockey at the University of Maine. At Maine, he was a teammate of his younger brother Dave Capuano and played on the same blueline as future NHLers Eric Weinrich and Bob Beers along with future Toronto Maple Leafs General Manager, Dave Nonis. He enjoyed a decorated college career, earning First-Team All-American honors in his junior year. His 32 goals remains the most ever by a Black Bear defenseman.