Do you play golf for money? Teach golf or run golf clubs? If so, you are then golf professional or colloquially called pro golfer. If you want to play in an amateur tournament, you cannot.Even if you have received money for playing golf even just once, you can revert to your amateur status.
Therefore, if you are already a professional golfer, you can only join professional golfers’ tournament. There are many golf tournaments for professional golfers and you surely will enjoy your status as professional golfer.