The fate of Sokka's sword is not explicitly shown or mentioned in the animated series "Avatar: The Last Airbender." After the conclusion of the series, Sokka's sword becomes a subject of speculation and fan theories.

One prevalent theory is that Sokka passed down his sword to his future descendants or to another capable warrior who would continue to use it. Another theory suggests that the sword might have been returned to the Southern Water Tribe or kept as a symbol of Sokka's legacy.

However, it's important to note that these theories are not confirmed within the series or by the creators, as Sokka's story was not further explored beyond "Avatar: The Last Airbender." Therefore, the ultimate fate of Sokka's sword remains unknown.