You can achieve this in two steps:
1. Create a full admin scan on the assigned policy in SEPM (set the Scan type in the properties to FULL SCAN).
2. Run the doscan.exe on client with the /ScanName switch
/ScanName "<Configured Scan Name>" - Runs the specified local or administrator scan.
- No additional scan options can be set – these will be taken over from the scheduled scan settings as configured in the policy
- The name of the scan needs to be specified
Some more reference to the Doscan tool:
DoScan.exe – SEP Antivirus scans from Command Prompt – Introduction
http://www.symantec.com/connect/articles/doscanexe-sep-antivirus-scans-command-prompt-introduction