For same SEZ state

Supply of goods or service to SEZ  unit  will be  treated as  zero  rated supply  and per section 16 sub section (b)  IGST will be applicable  with  refund .

or 

You can submit  LUT /BOND  for supply of goods or service 

Please confirm with others also .

supply to SEZs is considered zero rated supply as defined in sec 16 of IGST act

* Subject to the provisions of sub-section(5)of sec 17 of CGST act , credit of input tax may be availed for making zero rated supplies , notwithstanding that such supply may be an exempt supply. A registered person making zero rated supplies shall be eligible  to claim funds under either of the following options:

a)He may supply goods or services or both under bond or Letter of Undertaking(LoU), subject to such conditions, safeguards and procedure as may be prescribed without payment of integrated tax and claim refund of unutilised input tax credit; or

b) He may supply goods or services or both , subject to such conditions, safeguards and procedure as may be prescribed on  payment of integrated tax and claim refund of such tax credit paid on goods or services or both supplied, in accordance with the provisions of sec 54 of CGST act or the rules made there under.