Salt is known to work on Solaris but community packages are unmaintained.
It is possible to install Salt on Solaris by using setuptools.
For example, to install the develop version of salt:
git clone https://github.com/saltstack/salt cd salt sudo python setup.py install --force
SaltStack does offer commercial support for Solaris which includes packages. Packages can be found on the Downloads page of the Enterprise Installation Guide and are downloadable with a SaltStack Enterprise account.