Demmin attended Belhaven University, playing on the men's soccer team from 1990 to 1993. He was a 1991 Second Team and a 1992 and 1993 First Team NAIA All American.[1] In 1992, Demmin and his team mates won the NAIA national men's soccer championship. In 2008, he was inducted into the school's Athletic Hall of Fame.[2]