IBU Cup
After retiring from competition Groß settled in Ruhpolding. He has worked as a commentator on biathlon for German television and was appointed as coach of the German women's biathlon team in 2010. He was subsequently announced as senior trainer for the German IBU Cup team in April 2014. In August 2015 he became a senior coach for the Russian men's biathlon squad, agreeing a contract up to the 2017-18 season. In this role he guided the team to the 2016-17 relay World Cup title. In May 2018, Groß was announced as head coach for the Austrian men's biathlon team.