The 50-year-old, who worked for the road traffic department, was shot in the head in his home in the regional capital of El-Arish last night, the officials said.
The Sinai has witnessed a surge in attacks against security forces claimed by jihadist groups since the July 2013 ouster of Islamist president Mohamed Morsi.
On Thursday, militants from Ansar Beit al-Maqdis - which has pledged allegiance to IS in Iraq and Syria - claimed a string of attacks, including a car bombing, that left at least 30 people dead.
