As a member of the Australia men's national wheelchair basketball team, Ness competed at the 2000 Sydney, 2004 Athens, 2008 Beijing, and 2012 London Paralympic Games, winning a gold medal in 2008 and silver medals in 2004 and 2012. He captained the team at the 2008 and 2012 Paralympics. In 2016, he was selected for his fifth games, the 2016 Summer Paralympics in Rio de Janeiro where his team, The Rollers, finished sixth.