Sure can.
Look in the Installation Guide, section 5 "Next Steps". There you will find a section on agent installation. In particular you want to reference the section called "Silent installation of agent".
Here's a snip.
"You can perform a silent installation of Windows agent by using the agent.exe executable and InstallShield and Windows Installer commands." (I added the emphasis)
Use the information there to build the job in Altiris. I don’t know the exact steps anymore. It’s been a few years since I did it, but it can be done. Get with your Altiris guru’s to get the settings just how you need them.
Hope this helps!
Will