Yes, you can play Wavelength with 3 players. The simplest three-person setup is a cooperative house rule: one person becomes the Psychic, the other two discuss the clue and make one shared guess, and the Psychic role moves to a new player after the reveal. That gives the group a real conversation without splitting three people into uneven teams.
This guide explains a practical Wavelength for 3 players format for a table or video call. It is a suggested way to adapt the game, not a claim that every physical edition or app has a dedicated three-player mode. Check the rules for your copy when edition-specific player counts or scoring matter.