A CQ Rescue helicopter spokeswoman told The Courier Mail the man was in "considerable pain" and described it as "a horrific and freak ordeal".
Queensland Ambulance Service supervisor Shane Tucker told ABC the claws of the goanna would have caused damage.
"I would imagine it could have the potential for some significant, even life threatening, injuries due to the nature of the animal," Mr Tucker said.
"Definitely out of the ordinary. Sounds like he's quite lucky, however, to have sustained the injuries that he has and still be in a stable condition."