Pravin Mishra, a resident of Bharuch, is accused of collecting information about the Indian Armed Forces and defence research firms and leaking them to ISI.
Mishra fell victim to honeytrap by an ISI operative posing as a woman named Sonal Garg, who claimed to work for IBM Chandigarh.
Mishra, who used to work in Hyderabad, shared some important information with ISI, police said.
A case has been filed against Mishra, the ISI operative and any other Indian official if involved.