What was initially believed to have been a body, found off a major north Queensland road, has turned out to be a "lifelike" sex doll, police say.

A crime scene was declared after officers were called to a trail off the Bruce Highway, south of Bowen, about 7am on Friday.

Forensic police began investigations into what had been reported as a "body wrapped in a blanket".

But on Friday afternoon police confirmed the object was actually a lifelike replica doll, before a spokesman further clarified it was an anatomically correct female sex doll.

"Officers will continue investigations into the origins of the doll," police said, in a statement.

The crime scene has since been removed.