London-based Control Risks, a specialist in protecting organisations in hostile environments, will initially review security at Cairo and Sharm el-Sheikh airports, officials said.
The tourism minister denied the move was linked to the October 31 crash.
It was from Sharm airport that an A-321 operated by Russia's Metrojet left for Saint Petersburg before breaking apart in mid-air over the Sinai, minutes after take-off from the Red Sea resort.
Everyone on board, mostly Russian holidaymakers, was killed in what Moscow says was a disaster caused by a "terrorist attack".
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Based on information gathered by their intelligence services, Washington and London say it was likely a bomb caused the crash.
Wary of the impact on its lucrative tourism industry, a key foreign revenue earner, Cairo maintains there is no evidence a bomb brought the plane down.
"The Egyptian government has appointed Control Risks to commence work immediately to provide a comprehensive review of airport security in Egypt," Tourism Minister Hesham Zaazou said at a press conference.
"This will commence with the airports at Cairo and Sharm el-Sheikh immediately."
"Given Egypt's position as a major tourist destination... we have to address this global threat to security that is highly hiked up around the world," Zaazou said, speaking in English.
"This is why we are committed to a world-class gold standard in security at our airports."
He denied that the hiring of Control Risks had anything to do with the Sinai crash.
Hiring Control Risks did not mean Egyptian security teams will not be present at airports, Civil Aviation Minister Hossam Kamal said.