If there is no real official word for a player of padel, there is nevertheless a certain consensus around the word “padeliste ”.
Nevertheless, if you say padeleur, you aren't really wrong either.
We have also heard sometimes padelman and padelwoman… The drafting is not very keen on these terms. We hardly hear it.
If you want to be in the nails, however, say padeliste, you are sure not to go wrong!