"Sandcastle Disco" is a song by American R&B recording artist Solange Knowles taken from her second album, Sol-Angel and the Hadley St. Dreams (2008). It is produced by Soulshock & Karlin, who also wrote the song together with Knowles and Cee-Lo Green and was released as the album's second single in August 2008.

The song was released in the US in August 2008, but failed to receive a radio adds date, and thrived off moderate digital downloads and her promotional appearances, including debuting the video on TRL. Solange heavily promoted the song in the US with performances on the Late Show with David Letterman in late August and Jimmy Kimmel Live! in September.

The single received major airplay on UK music channels but did not pick up significant airplay on radio formats. She promoted the song on The Paul O'Grady Show and Later... with Jools Holland in November 2008. Due to limited radio airplay, the single failed to chart on downloads alone in the proceeded weeks before the release date.

On December 20, 2008, the song notched the number one spot on the US Billboard Hot Dance Club Play chart.

The music video is the directorial debut of Solange Knowles. The video was almost entirely made using computer-generated imagery, and features abundant stage and costume changes.

The video begins with Solange singing and dancing in a white room in a blue dress in front of her band. Then in the background CGI clouds appear, and Solange draws a sun with her hand, setting the stage for the video. Next she makes bricks appear and disappear, while palm trees spring up on the sides of the room, continuing to set the video's stage. Solange then plays with some hearts and lets out a rainbow ball that wraps around the room.

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