Hi KK
Please see the below links where we have multiple suggestions on loadbalancing tomcat.
Chapter 3. Configure load balancing using Apache and mod_jk
The Apache Tomcat Connector - Generic HowTo - LoadBalancer HowTo
The above links actually give scenarios and management of sessions by apache with tomcat. The SAP has only few web based applications which need to be deployed on web server and loadbalancing has little to do with them.
Its basically a task where you can take the assistance of your network admins to provide a solution for loadbalancing appropriately, while you would only need to deploy the web apps provided by SAP to 2 or more tomcat instances.