I think i have a an oil tank at the my front lawn. I want to build a driveway over it is it possible?

Call your municipality and ask them. They're the only ones who can answer your question.

Not knowing where you live may change the answer. That said, if in Ontario go to this page and review the questions:

https://www.tssa.org/en/fuels/storage-tanks.aspx (Keep in mind, if discovered during soil removal for driveway the company may choose to cease all work.)

"How do I remove...?"
Only a TSSA-registered Petroleum Contractor is qualified to perform the removal of your underground (buried) fuel oil tank. Before you hire a contractor, be sure to ask for the TSSA contractor's registration number, as all contractors must be registered.
Please note that in case of any fuel oil spill you must also notify the Spills Action Centre of the Ministry of Environment and Energy by calling 1-800-268-6060.

No longer in use, do I have to remove...? (my rephrasing of the question)
Yes, Ontario regulations require you to remove an unused underground storage tank.
The TSSA may issue a Variance to allow an underground tank to be abandoned in the ground. You must submit an application for a Variance to the TSSA in order to get approval to abandon your fuel oil underground storage tank. We review your variance application, which takes approximately 21 business days, and provide written notification informing you of the outcome of your application.

Old heating oil tanks can have oil left in them, leak and cause major contamination which is expensive to clean up.
Have it removed and hope it hasn't leaked.

Do you mean a septic tank rather than an oil tank?

https://www.mrrooter.com/greater-syracu ... ptic-tank/

Depending on the age and neighbourhood of OP's house it could also be a cistern.