Hamon is a "Nomi" monster. ("This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by...".)
This means that even if you properly Special Summoned it and then it gets sent from the field to the Graveyard or gets removed from play, you still can't Special Summon it back. The only ways to do so would be if the effect ignores (any and all) the Summoning conditions or the effect Special Summoning it treats the Special Summon as the same method printed on the card.
Otherwise, you will have to return it to your hand and then properly Special Summon it again.