As a foil fencer, Wienand was a long-standing member of the national fencing team of Germany and the German Olympic teams of Atlanta 1996 and Sydney 2000. He won the World Youth Championships in 1989 in Lisbon, finished in 4th place at the 1996 Summer Olympics in Atlanta and won the bronze medal at the 1999 World Fencing Championships in Seoul. He came 2nd in the individual competition at the European Fencing Championships 1998 in Plovdiv, where he also won the European championship with Germany's men's foil team, as well as winning the World Cup Series in 1997. Wienand was number one of the world ranking list and won seven World Cups and several German National Championships.