Pushing employee to go on STD – Quebec

Hello,
I have an employee who is on light(modified) duty based on his doctor’s note. It has been more than 3 months and there is nothing anymore that this employee can do as his job requires to be on his foot and is very hands-on in nature. We have been giving him whatever he could help during this past months. He is scheduled for another assessment soon, but if he comes back with another note stating that he should be on a light duty, is it possible for an employer to ask him to go on STD to take the leave based on the reason that there is no work for him to perform.
I appreciate your feedback.