"It is not a correct forum," a bench comprising justices Aftab Alam and Ranjana Prakash said while dismissing the PIL filed by an advocate.
The PIL filed by M L Sharma had sought an SIT or Central Vigilance Commission (CVC) probe under the supervision of the apex court without involving CBI which, it had alleged, was under government's control.
It had also asked for a direction to the Defence Ministry to scrap the contract with Italian company Finmeccanica for the supply of 12 AW101 helicopters. Finmeccanica's subsidiary AgustaWestland manufactures the choppers, three of which have been delivered to India to ferry VVIPs.
The PIL was filed after Defence Minister A K Antony had ordered a CBI probe into the allegations of payment of bribes to clinch the deal.
Giuseppe Orsi, who was the head of Finmeccanica, was arrested last month on charges of tax fraud and corruption including alleged pay-offs in the chopper deal. India has put on hold the receipt of the remaining helicopters as well as rest of the payment for the deal struck in 2010.