The Estevan man, 67, had been out with a group on his snow machine Monday when he turned a corner on a trail and hit a coyote, the RCMP said.
That apparently led to a fatal chain of events. The man entered some deep snow and was thrown from the vehicle as it entered the trees, hitting his head on a tree.
He was found partially buried in the snow, not breathing.
An ambulance crew and RCMP were dispatched, but it was too late.
The coroner's office was contacted, the RCMP said.
The man's name hasn't been released.
The crash happened in the Chemong area in the northeast part of the province, about 45 kilometres northeast of Hudson Bay.