Two years later, Quinn turned to junior hockey, serving as head coach for Team Canada in the 2008 IIHF World U18 Championships. He led Canada to the finals against Russia, taking the title by an 8–0 score. With established success at the junior international level, Quinn was chosen to coach the Canadian under-20 team for the 2009 World Junior Championships as the host country in Ottawa. He led Canada to an undefeated record in tournament play and a fifth consecutive gold medal, defeating Sweden 5–1 in the final.