Sajnagachhya is a village in Kolaghat tehsil in district of Purba Medinipur, West Bengal, India. As per the data provided by Census of India in 2011, total population of Sajnagachhya was 812 which includes 428 males and 384 females. Sajnagachhya covers 34.09 ha area. Pincode of Sajnagachhya is 721154.