Sibiraj is an actor, working in the Tamil film industry. Sibiraj is the son of Indian film actor Sathyaraj. Sibiraj did his schooling in Sherwood Hall Senior Secondary School and Don Bosco Matriculation Higher Secondary School and went to Loyola College where he completed a degree in commerce.
Sibiraj started his acting career with the 2003 film Student Number 1, which was a box office failure. In his next four films, Jore, Mannin Maindhan, Vetrivel Sakthivel and Kovai Brothers, he acted with his father, Sathyaraj, who also produced Sibi's following project, Lee, directed by Prabhu Solomon, where he played the role of a football player.
Sibiraj took a break from acting and his next release Naanayam released three years after Lee. The film directed by Shakti Soundar Rajan saw Sibiraj playing his first negative role. Although his performance was well received, the film did not fare well.
Following Naanayam he went on another sabbatical, during which he pursued an acting workshop at the New York Film Academy (NYFA) in Los Angeles for three months, before returning in 2014 with Naaigal Jaakirathai, again directed by Shakti Soundar Rajan.
On 14 September 2008, Sibiraj got married to Revathi, an engineer who works for an IT company in Chennai. The two had been in a relationship for ten years before getting married.