The short answer is yes. Common recorders which are often made for right-handed people can be played left-handed by merely adjusting the positions of the lower and the upper hand. You will then plug the remaining redundant hole with some wax or any other material. But this is only possible for a recorder which has a double lowest finger hole. If there is none, then you can’t essentially “play it in reverse” as a lefty. You’ll have to buy a special left-handed recorder, which can be a bit trickier to find.