Is there any way to relocate a belly button to its original position after a tummy tuck with floating belly button surgery?

It is difficult to make suggestion without seeing pictures. One option would be to make you a new belly button however you may not like the scars it leaves behind.

Thanks for your question. It is extremely difficult to reattach the umbilical stalk due to the fact that its main blood supply has been severed from below. I have attempted this operation with moderate results by delaying the process in staged procedures. All the best,Dr. ResultsMiami, FL

Photos would be helpful in responding to your question, including before pix if available. Three inches is an awful lot of movement for the navel using that technique, and in most settings with that much upper abdominal laxity a standard abdominoplasty might have been a better choice. Unfortunately there are not a lot of good options at this stage,  The navel could be transferred as a skin graft to a higher location.  That would leave a scar at its current location, and even a 100% take of the graft might not look quite right. Reposting your question with photos might lead to a reasonable suggestion. All the best.