It's possible you are thinking of a different song, perhaps one from the English dub of the anime, or a fan-made song.
Could you provide more information about the song you're looking for? For example:
* Which version of Sailor Moon are you thinking of? (Original Japanese or English dub?)
* What are some lyrics you remember?
* Do you know what character sings it?
With more information, I can help you identify the song!