Letsch never played professional football. He started his coaching career at VfB Oberesslingen/Zell as playing coach. In July 2001 he became manager of Stuttgarter Kickers's second team until 2002, but was also a part of the first team staff until the end of the 2002–03 season. Then he moved to FC Union Heilbronn and was the manager for one season. From January 2005 until July 2007, he was the assistant manager of SSV Ulm 1846. From January 2008 to June 2009, he was the manager of SG Sonnenhof Großaspach.