The 'Milk' director - who is one of the filmmakers being considered to direct the big screen adaptation of E.L. James' erotic novel - filmed the steamy scene as demo to convince movie studio Universal to hire him for the job, reports TheWrap.com.
The scene features the 'Magic Mike' actor as bondage-loving businessman Christian Grey, however, the identity of the actress playing protagonist Anastasia Steele is not known.
The salacious scene is thought to depict Anastasia losing her virginity to her enigmatic boss.
Movie studio Universal, which is behind the big screen project, has not commissioned any test reels for the film and has not yet made a decision on a director.
Van Sant reportedly created the scene on his own accord.
The director has previously earned Oscar nominations for 'Milk', which starred Sean Penn as openly gay politician Harvey Milk, and 'Good Will Hunting', which was written by Matt Damon and Ben Affleck and shot the actors to fame.
'Magic Mike' hunk Pettyfer will next be seen in Lee Daniels' 'The Butler' with Oprah Winfrey, Terrence Howard and Forest Whitaker.