The Ministry of External Affairs (MEA) said the Indian High Commission in Islamabad was not even informed about Jadhav's trial before the court.
While addressing media MEA spokesperson Gopal Baglay said that Pakistan has not shared any details of Jadhav " s location and about his health till date.
On Monday, Pakistan's military sentenced Jadhav to death on charges of espionage and sabotage.
Baglay said India was engaged in efforts to bring back Jadhav but added that he would not like to speculate on the steps being taken, including who all New Delhi may talk to.
If Pakistan executes the death sentence against Kulbhushan Jadhav it will be treated as murder of an Indian national, Minister of State for Defence Subhash Bhamre today said.
The Indian naval officer had confessed to committing and planning subversive activities inside Pakistan.
Jadhav, who hails from Mumbai, was "arrested" on March 3 a year ago by Pakistan security officials allegedly in Balochistan which, they said, he entered from Iran.
India and Pakistan also have a bilateral agreement on consular access, Bagley said while adding, "India had discussed Jadhav's kidnapping issue with Iran past year".
Earlier, Swaraj warned Islamabad of consequences in bilateral relations if Jadhav's death sentence is carried out.
About his fake passport and identity, Baglay said, "We can not ascertain anything since we did not have any consular access".
External Affairs Minister Sushma Swaraj on Tuesday rubbished reports that Congress leader Shashi Tharoor will help the Narendra Modi government in drafting a statement on Kulbhushan Jadhav to be read out in Parliament.
Asif said three appellate forums are available under the law to Jadhav, whose family lives in Mumbai, Dawn online reported. She had further added, "Will go out of the way to save him, wo poore Hindustan ka beta hai...."
Basit said that Jadhav has been given a fair trial and assured that he will be given the right to appeal or seek mercy.