The Play Store doesn't provide this facility.
You could change the namespace (for testing), and upload it using a different name. i.e. cloak it as a different branded app, and if it does well, upload the real one.
You could set up a web site with downloads, or use another app store.
You could use a third-party service to manage beta a release. e.g. https://www.zubhium.com/
