On June 25, 2003 Sneddon was named the fourth head men's hockey coach in Vermont history, replacing the retiring Mike Gilligan.
[6] After a nine-win season in his first year at the helm of the Catamounts, Sneddon guided Vermont to the 2005 ECAC Hockey Tournament third-place game, losing to Colgate 2-1.
A year later, with Hobey Baker Award finalist Viktor Stålberg, Sneddon led Vermont to a 22-12-5 record as the Catamounts made its fourth NCAA Tournament appearance, defeating Yale and Air Force in the East regional to reach the Frozen Four for the second time in school history, and first since 1996.
[7] Sneddon has since guided the Catamounts to NCAA Tournament appearances in 2010 and 2014, and also reached the Hockey East Championship semifinals in 2015.
On February 5, 2020, Sneddon announced that he would retire and step down from his coaching position at Vermont after the conclusion of the 2019-20 season.