The assault concerned a militant ambush in opposition to a border guard checkpoint west of the Mediterranean metropolis of Rafah, which borders the Gaza Strip.
The navy mentioned not less than 5 troops, together with an officer, had been killed within the assault. A minimum of seven militants had been additionally killed, it mentioned.
It was the second militant assault in lower than every week.
Final Saturday, not less than 11 troops had been killed, in one of many deadliest assaults on Egyptian safety forces in recent times.
The Islamic State group additionally claimed that assault, which happened within the city of Qantara within the province of Ismailia, which stretcheswards east from the Suez Canal.
Egypt is battling an insurgency in Sinai that intensified after the navy overthrew an elected however divisive Islamist president in 2013. The extremists have carried out scores of assaults, primarily focusing on safety forces and Christians, however the tempo has slowed in recent times.