The 20-year-old, who joined the club in January, has admitted that he was "really impressed" with the support he gained last season.
"I was really impressed with the Wimbledon support when I joined and I was determined to put in good performances for the club," he told the club's official website.
"My favourite moment was when I scored my first goal at Dagenham & Redbridge because it was an important goal and it helped the team out at a tough time.
"I have enjoyed my time so far at Wimbledon and I am happy to have signed a new contract."
Sainte-Luce scored twice in 14 appearances last season.