The volcanic eruption and tsunami hit the island nation on Saturday, sweeping Atata local Lisala Folau out to sea.
Mr Folau told the BBC that he held on to a floating log during his 27-hour ordeal at sea, before finally reaching the shore again.
Tonga has confirmed three deaths though the extent of damage is still unknown.
Mr Folau, 57, told the BBC's Newsday programme he was scared when he saw the wave approach, but "I had my faith in God he would save me".
