From this page, it seems that you can, yes:
http://support.microsoft.com/kb/260910Updates and fixes to Microsoft Windows 2000 are distributed in service packs. Service packs keep the product current. Service packs include updates, system administration tools, drivers, and additional components that are conveniently bundled for easy downloading. Service packs are cumulative. Therefore, each new service pack contains all the fixes that are included in previous service packs together with the new fixes. You do not have to install a previous service pack before you install the latest service pack. For example, you do not have to install Windows 2000 Service Pack 3 (SP3) before you install Windows 2000 Service Pack 4 (SP4).
Windows 2000 service packs are for Windows 2000 Professional, for Windows 2000 Server, and for Windows 2000 Advanced Server.
Also, on the original link that I gave you, it has supported operating systems listed as follows:
System Requirements
Supported Operating Systems: Windows 2000; Windows 2000 Service Pack 2; Windows 2000 Service Pack 3
Odd that I don't see SP1 listed, which is why I thought you might need service pack 2 first. I'd say to just visit the windows update site and download whatever updates that you need...