For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jsegitz:branches:security:SELinux_bsc1261035/standard/home:jsegitz:branches:security:SELinux_bsc1261035.repo
zypper refresh
zypper install selinux-policy
For snapshot run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jsegitz:branches:security:SELinux_bsc1261035/snapshot/home:jsegitz:branches:security:SELinux_bsc1261035.repo
zypper refresh
zypper install selinux-policy