There are two in the Disney area, well sort of.
One is at the Loop, a new shopping complex on Osceola Parkway. If you were to leave Disney property on via this parkway (it runs from the entrance of DAK pretty much almost to the airport) it would be about 5 miles down that road.
The other is on "Restaurant Row" which is Sand Lake Road, pretty much near Universal, I'd say about 4 miles away.
But they are a growing chain, here is the website if you want to check to see if there is one near you.
http://www.bonefishgrill.com/