She was born on 12 July 1989 the only child to a Christian mother, Sharon Singh Chauhan and a Hindu father, Vijay Singh Chauhan. She was schooled at La Martiniere, Kolkata. She completed her higher education from Mount Carmel College, Bengaluru.

The hospital began treatment but she succumbed to her injuries 40–45 minutes after the accident. On 2 May 2017, Sonika's funeral Mass was held at St. Thomas Church, Kolkata. Later, she was buried at Lower Circular Road Cemetery. ^[7]

On 12 July 2017, 'Sonika Chauhan 27 Foundation' was launched by her parents at Tollygunge Club as a gift and a contribution to Sonika Chauhan on her birthday.^[8] 'Sonika Chauhan 27 Foundation' will take forward the legacy of Sonika Simone Singh Chauhan by touching the lives of young people, without any discrimination of caste, creed or religion.^[9][10]