You could try in this thread:
http://originaltrilogy.com/forum/topic.cfm/Brashs-Star-Wars-Sound-Effects-Archive-A-collection-of-the-best-Star-Wars-sounds-for-use-in-Fan-Editing/topic/12364/
If it's the sound I'm thinking of - more of a "pssht" than a "whoosh" - I think it's quite "clean" where it appears in the film, no background music and not much background noise. You may get acceptable results just by ripping the DVD audio.