You can obtain the latest packages for both the Oracle Solaris 10 OS and the Oracle Solaris 11 OS. Note that the Oracle VM Server for SPARC software is included by default with the Oracle Solaris 11 OS.
Oracle Solaris 10 OS. Download the OVM_Server_SPARC-3_1.zip package from My Oracle Support. See How to Download the Logical Domains Manager Software (Oracle Solaris 10).
Oracle Solaris 11 OS. Obtain the ldomsmanager package from the Oracle Solaris 11 Support Repository. See How to Upgrade to the Oracle VM Server for SPARC 3.1 Software (Oracle Solaris 11).
$ unzip OVM_Server_SPARC-3_1.zip
See Location of the Oracle VM Server for SPARC Software in Oracle VM Server for SPARC 188.8.131.52, 3.1.1, and 3.1 Release Notes for details about the structure of the file and what it includes.