The package is not available in the installation DVD, nor internet (MOS, Google, etc.). Where could I get it?
If you do have support from Oracle for Solaris 8 then you'll have to log a support call with them to request a copy of the "SAN Foundation Kit" aka SFK.
However... Solaris 8? Really? Can you not upgrade to a release that's less than 10 years old? Solaris 11 (and even the Solaris 10 Updates) that you can get from Oracle have muchmuch better FC support than was ever available in Solaris 8 or 9.
I know we downloaded the pkg from Sun for our Solaris 8 systems back in the day. I'm not sure if they did this, but you could always check the media for a newer update of Solaris 8. Perhaps you'll find the packages there.
Official statement from Oracle:
Sun products, patches, updates and firmware are now accessible only through the Oracle Technology Network, Oracle Software Delivery Cloud and My Oracle Support. To learn more, refer to the Sun Download Center Announcement.
Have you that one?
You could borrow similar packages from
OpenSolaris project, e.g. here
Also, of course, please specify your Solaris version and platform.