It said another officer was wounded in the blast on Saturday, AFP reported.
ISIL's (also known as Daesh) Egyptian branch is waging an insurgency in the restive peninsula that has killed hundreds of soldiers and policemen since the military overthrew President Mohammad Mursi in 2013.
The terrorist group has claimed it caused the crash of a Russian passenger plane carrying holidaymakers over Sinai last October, killing all 224 people on board.
It said it had smuggled a bomb on board the plane at a south Sinai resort airport.
The Sinai militants pledged allegiance in November 2014 to ISIL, which controls parts of Iraq and Syria.