Poisson, 35, was training downhill at the Alberta resort of Nakiska ahead of World Cup races in Lake Louise, also in Alberta, in two weeks.
Poisson took bronze in the 2013 World Championships downhill. He also competed in the 2010 and 2014 Olympics with a best finish of seventh in the 2010 downhill.
Poisson made one World Cup podium, taking third in a downhill in Santa Caterina, Italy, on Dec. 29, 2015.
“Poisson was a respected and accomplished athlete on the World Cup tour ever since his debut in 2004,” the International Ski Federation said in a statement.