Yes there are but I dont know about the phrase "...good coffee plantations..."
That is, there are plenty of small holding coffee plantations in northern NSW but whether or not anyone thinks they are "good" or not is up to the individual and depends on what anyone expects in a "good coffee plantation".
Not trying to be difficult.
Decide what area you will be in or close to, and do an internet search of something like "coffee plantations in..........." or maybe "coffee plantation tours in......" .
Hope that helps.