Use the Websphere Monitor(Websphere Applciation server Monitor ) . To create this monitor you will have to create WS environment on the SiteScope Server
There are two wys of setting WAS Environment .
1) External JVM
I would suggest to use the Internal JVM option and isntead of isntalling the WAS Client , Jsut copy the WAS files from WAS Server, Refer the SIS Doc SiteScopeMonitorReference . Chapter 104: WebSphere Application Server Monitor
Whats the WAS Verison and SiteScope Version , Let me know if you need any help in setting up .