A giant statue of Poseidon appears in Olympus durning the beginning of God of War: Ascension'smultiplayer mode. If the warrior activates it then they can choose to submit their soul to Poseidon.
The Temple of the Gods, in the depths of Tartarus, contains a statue of Poseidon, along with a statue of Zeus and Hades. After obtaining the Gauntlet of Zeus, Kratos must shatter the statue along with the other two.
In game, Kratos visits Atlantis, the city of Poseidon, that contains many statues of the sea god. Later on he manifests himself in one of the statues to threatened Kratos of the destrustion of his city.