No, you cannot directly connect a Sonos speaker to an HDMI port. Sonos speakers use a wireless connection to stream audio, and they typically connect to your home network via Wi-Fi. However, if you have a Sonos soundbar that supports HDMI ARC (Audio Return Channel), you can connect it to your TV's HDMI ARC port for audio playback. In this case, the HDMI connection is used to pass audio from the TV to the Sonos soundbar.