The car’s explosion killed seven, but the military said the death toll would have been above 50 had the tank not acted.
The beaches of southern Sinai are popular with Israelis.
Sinai Province is believed to be behind the downing of Metrojet Flight 9268.
Security forces blocked a suicide bomber driving into a hotel, but his car exploded
The group pledged allegiance to ISIS in 2014 and claimed responsibility for the Russian plane crash.