The chruch doesn’t actually condemn Sola Scriptura, I don’t think they go around condemning things, they simply don’t agree and provide guidance. There is nothing in the bible that says we should only believe stricly what is written in the Bible alone.
I think this might be where RC's get off track about Sola Scriptura. There are two understandings of the term.
First, that all that is necessary to come to Faith in Jesus Christ is contained in Scripture. Second, that no doctrine, dogma, religious practice should be followed if it is not clearly found to be supported in Scripture. It is the second definition that has caused all the angst because it supersedes any claimed authority of any body of clerics.