In early 2003, Sibi was set to make his acting debut through
Swami, the Tamil remake of the Malayalam film
Nandanam (2002), directed by
Renjith. However, despite beginning pre-production work, the film was later dropped. Sibi then started his acting career with the 2003 film
Student Number 1, which was a box office failure. In his next four films,
Jore (2004),
Mannin Maindhan (2005),
Vetrivel Sakthivel (2005) and
Kovai Brothers (2006), he acted with his father,
Sathyaraj, who also produced Sibi's following project,
Lee (2007), directed by
Prabhu Solomon, where he played the role of a football player. In his early years, several films he was announced to be part of, such as
Perumal Swamy, Subsequently, Sibi took a break from acting; his next film,
Naanayam (2010). was released three years after
Lee. The film, directed by
Shakti Soundar Rajan, saw Sibi 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. The film, which Sibi reportedly accepted after having listening to more than 200 scripts, featured him alongside a
Belgian Shepherd dog as the protagonist. His next titles were
Pokkiri Raja (2016),
Jackson Durai (2016),
Kattappava Kanom (2017) and
Sathya (2017). Then, Sibiraj played a cop in the action crime thriller
Walter, directed by U. Anbarasan. Then he appeared in
Kabadadaari (2021) a neo-noir thriller directed by Pradeep Krishnamoorthy, a remake of the Kannada film
Kavaludaari. In 2022, he appeared in three films including
Ranga,
Maayon and
Vattam. ==Personal life==