Sandhya, also called 'Sandy', was born in Mumbai to P. R. Mridul and his wife. Later, the family moved to New Delhi. At age ten, she left home to attend school at Maharani Gayatri Devi Girls' Public School in Jaipur. She later attended Mater Dei Convent School in New Delhi. At age 14, her father, a lawyer and later a judge of the high court, died and she was brought up by her elder brother Siddharth Mridul who is a sitting judge of Delhi High Court. She has another elder brother named Pankaj.

 

She attended Lady Sriram College, Delhi. She graduated in Mathematics, did her post graduation in marketing and went on to do a corporate job with KLM in Mumbai.