You could start by checking the official websites of major film studios that were active in 2000. Sometimes, they have archives or links to where you can access their older films with subtitles. Another possibility is to search on specialized subtitle websites, which might direct you to where you can find the full movie.
One option could be to search on dedicated movie databases or forums. Sometimes, fellow movie enthusiasts share links or information about such films. Also, check out some classic movie rental websites, as they might have it in their catalog.
You might try looking on popular streaming platforms like Netflix or Amazon Prime. They often have a wide range of movies, including older ones with subtitles.