Military spokesman Brigadier Mohamed Samir said the forces also seized four hand-made bombs, two mortars and 45 electric detonators.
Forces managed to kill two of the terrorists, he said in a statement.
Egypt's Sinai has witnessed several violent attacks by militants since the January, 2011 revolution that toppled the longtime president Hosni Mubarak.
The attacks targeting police and military increased after the ouster of Islamist president Mohamed Morsi in 2013 by military following massive protests against his rule.
Over 700 security personnel have been reported killed since then.