Yes he has played negative or anti hero role but those films have not fared very well.
Fox (2009)
Fox was a suspense thriller made in 2009 starring Sunny Deol, Vidya Malwade, Arjun Rampal etc. The film was a critical and commercial failure. Sunny Deol played the main culprit in the film who tried to frame Arjun Rampal in a m***er case for revenge. The film was a major critical and commercial disaster.
Right ya Wrong
A delayed film starring Sunny Deol and Irrfan Khan. Sunny Deol plays a police officer who m***ers his wife and his brother for cheating and then passes it off as an accident. Sunny Deol is not the villain but this was a grey role where Irrfan plays the honest inspector and dear friend of Sunny who tries to prove that Sunny Deol is lying. The film is watchable for Irrfan Khan’s brilliant performance. Rest all in the film including Sunny Deol’s performance is passable.
Arjun Pandit
Again not a villain but anti hero. Sunny Deol plays a pandit who is unable to give the correct testimony upon witnessing a crime. Years later, Juhi Chawla frames him as a revenge for his weakness. Sunny Deol ends up in jail where he decides to take his revenge by turning into a Don and torments Juhi Chawla only for both of them to reconcile in the end.