/tmp is for temporary storage. See if it is cluttered up with stuff not needed anymore. If that is not the case, have it increased. Do not try to re-route it.
To link a directory /x/y to filesystem /z, do
ln -s /x/y /z/y
Anything that is written to /z/y will end up in filesystem /x.
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.