You'd go to /config/plugins/DNLA_5.0.0.0/profiles, copy one of the profiles, then modify it to match your Sonos. The Marantz or Denon AVR profiles are good starting points, since they are also audio only devices.
Specifically, you'd need to change the "Name" and "Identification" sections of the profile. Based on what is in your log, that'd look like this.