Audard has joined the Stade Louis II outfit on a season-long loan.
In exchange Monaco have allowed young duo Sebastien Grax and Nicolas Hislen to move in the opposite direction on loan.
The former Toulouse goalkeeper will help fill the void left by Tony Sylva's departure to Lille.
The 26-year-old will provide cover for first-choice Flavio Roma at the Principality next season.
