He belonged to the spiritual lineage of Lord Nityananda. Four generations of Sadashiva's family were parsadas or Devotees of Lord Gauranga.
A Vaidya by caste, Sadashiva was the son of Kansari Sen. Sadashiva's son was Purushottama dasa. His grandson was Kanu Thakura.
The twenty-third and twenty-fourth prominent Devotees of Nityananda Prabhu were Sadashiva Kaviraja and his son Purushottama dasa, who was the tenth gopala. (CC. 1.11.38).
C.B. Antya 5 Text 741: Sadashiva Kaviraja was very glorious and fortunate. His son was named Purushottama dasa.
Sadashiva Kaviraja is glorified in Shri Gaura Ganoddesha Dipika verse 156 as follows:
"Chandravali-gopi, who had been very dear to Lord Krishna in Vrajabhumi, appeared in Bengal as Sadashiva Kaviraja."
The present Goswami families of places such as Bodhakhana, Bhajanghat, etc., descend from Sadashiva.