According to The Legend of Zelda: Hyrule Historia, Nintendo's official Legend of Zelda chronology, The Wind Waker takes place in the ''New World'' timeline, one of several parallel timelines in which Zelda games are set following the events of Ocarina of Time. The game follows the ''Adult Link'' timeline, after Link, the ''Hero of Time'', defeats Ganon and time-travels back to his childhood. A crisis emerges when Ganon returns, but Link does not. Centuries later, the people live on islands in the Great Sea. They preserve Link's story as a legend, but his kingdom's fate is unknown. The main character, a young boy also named Link, lives on Outset Island, where boys dress in green like the Hero of Time when they come of age.

is wind waker a sequel to ocarina of time?
yes