"This means international flights will have a security patrol vehicle driving behind them, with a clear line of sight of the undercarriage," airport spokeswoman Deidre Davids told the Cape Times.
She said the security presence on the airport's perimeter fence had also been strengthened.
A man last seen climbing over the airport fence was found dead a week ago in a British Airways plane in London. He had apparently run towards a runway where the plane was in its holding position, ready for take-off.
His body had apparently not been identified.