Santhosh Kumar, known professionally as Sandy Master (born 5 July 1986 in Chennai, Tamil Nadu), is an Indian dance choreographer and actor who works predominantly in the Tamil film and television industry. The son of a retired police officer, Sandy discovered his passion for dance early in life and competed in school and college dance competitions before pursuing it as a career. He made his breakthrough as a choreographer through the Kalaignar TV dance reality show Maanada Mayilada, where his mentor Kala Master gave him the opportunity to choreograph a team that went on to win the title. He subsequently choreographed for several Tamil films including Aaaah (2014), Saagasam, Kadhalum Kadandhu Pogum, Gethu, and Kaala (2018), the latter earning him personal appreciation from Rajinikanth. He has also served as a judge on Kings of Dance and other Tamil dance reality shows, and owns three dance studios in Chennai. In 2019, Sandy participated in Bigg Boss Tamil Season 3, where his spontaneous humor and genuine personality made him one of the most beloved housemates of the season. He finished as the first runner-up after 104 days.

Choreographing for major Tamil films including Rajinikanth's Kaala (2018); serving as judge on dance reality shows including Kings of Dance; finishing as first runner-up on Bigg Boss Tamil Season 3 (2019).

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