He was born and brought up in Achalpur (twin town of Paratwada) in Amravati District of Vidarbha region in Maharashtra.
In his earlier career, Sadhu worked in different capacities on the staff of a few national English newspapers and then served for six years as a professor and the head of the Department of Communication and Journalism at Pune University.
[3] Sadhu, the outgoing president of 2008 Marathi Sahitya Sammelan held in Sangli left its inaugural function, protesting that Marathi writers who were sitting on the Sammelan platform along with some politicians were being "overshadowed" by the politicians by way of curtailment of time slots in the inaugural schedule for the writers on the platform through presidential protocol.
On his death, Maharashtra Chief Minister Devendra Fadnavis said, “Arun Sadhu’s novel Sinhasan and Mumbai Dinank are landmark in Marathi literature.
I offer my deep condolences and share the sorrow of his family and friends,” [6] Arun Sadhu : vyakti ani wangmayadarshan, Ph.D. Thesis by Dr. Rahul Hande, Sangmner