Provincial Police Sgt. Ronald McInnis said a highway worker found the body just before 8 p.m.
Investigators went to the scene and the body was taken for an autopsy to determine the man's cause of death, he said.
"In the next few days, we're going to look at our files for missing person and try and know who this person is," he said.
McInnis said it's unclear how the body ended up on the side of the highway.