No, there is no such thing for OS 9. Project Builder is based off NeXT Step COCOA so it's only been designed to run in OS X, OS 9 would be a pain.
Your only choices in OS 9 seem to be code warrior and RealBasic. However recently Steve Jobs declared OS 9 dead for development, so you'll probably want to start looking to upgrading to OS X. When you do, you'll be able to download the latest developer tools which include Project Builder.