The pyside2uic Python module is installed when pip installing the PySide2 wheel built from pyside-setup. It's just that the Compiler module isn't included.
Here I'm trying to execute the pyside2-uic executable in Ubuntu 14.04:
I'm also seeing this on OS X. Here's how you can repro this in Ubuntu 14.04:
The wheel comes from my wheel building Github repo (Travis CI builds the wheels): https://github.com/fredrikaverpil/pyside2-wheels/
You can review the complete build log in Travis CI.
The bintray holding the wheels: https://bintray.com/fredrikaverpil/pyside2-wheels/pyside2/2.0.0.dev0#files