The man was apprehended last evening when a Central Industrial Security Force (CISF) personnel, deployed for the airport's security, found him roaming suspiciously inside the terminal-III building, a senior official in airport security said.
The man was identified as Nuwan U Fernando, a resident of Sri Lanka, he said.
He told the CISF personnel that he had come to see off his mother, who was travelling to Colombo from the Indira Gandhi International Airport (IGIA), the official said.
He was then handed over to the police which filed an FIR against him under various sections of IPC, he said.
Entering airport terminal without a valid ticket is illegal under Indian aviation rules.
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