The man, identified as Ahmed Ashraf, was arrested last night in a Colombo suburb after the Maldives asked Sri Lanka to cancel his visa, immigration department spokesman Lakshman de Zoysa told AFP.
De Zoysa said he was not deported but instead handed over to the Maldivian authorities in Sri Lanka for repatriation.
"We acted on a request from the Maldivian High Commission," he said.
"As he no longer had a valid visa he was asked to go back. He went this morning. His ticket was arranged by the High Commission."
President Yameen was unharmed in an explosion on his speedboat on September 28 that slightly injured his wife and was described by authorities as an attempt on the leader's life.
Media reports in the Maldives said Ashraf, one of eight suspects wanted by the Maldives in connection with the blast, was arrested on arrival and sent to a detention centre for interrogation.
Maldivian Home Minister Umar Naseer said on Sunday that eight suspects had fled the country and gone into hiding.
The Maldives has faced tough international criticism over the jailing in March of its first democratically elected leader Mohamed Nasheed, after a rushed trial which the UN said was seriously flawed.
Yameen, who came to power in November 2013 following a controversial election, faces international censure over his crackdown on supporters of opposition leader Nasheed and other opponents of his regime.
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