The 31-year-old 'Halo' hitmaker had played a part of the song for an H&M commercial and also performed it at a concert in Belgium back in May, reported Huffington Post.
A complete version of the song seems to have appeared online but it is yet to be confirmed if it the same.
'Standing on the Sun' is the second track of the singer to have leaked this year. The first was the demo version of 'Grown Woman'.
Even though Knowles has already performed the two songs at a concert, but an official release is still awaited.