I found that Sirasa TV, a popular TV channel in Sri Lanka, has aired the Sinhala dubbed version of "Mouse Hunt" in the past. However, I couldn't find a specific airing schedule or a link to watch the full movie online.
While Sirasa TV periodically broadcasts the movie, clips and segments of the Sinhala dubbed version can often be found on social platforms like Facebook and TikTok. For the original English version, it is frequently available on major streaming platforms like Netflix or Tubi . Watch Mouse Hunt - Netflix mouse hunt full movie sinhala sirasa tv