I am assuming you are not referring to Message Broker. I do not believe there is an MQ agent available but you can see if MQ tagging can be utilized in your case. For this you don't need to instrument the queue manager with a separate Sensor or Agent. You just have to make sure the tier/app that PUTs and the tier/app that GETs are both instrumented by an Agent that supports MQ tagging. Also if your environment requires using the queue or queue manager names to uniquely identify messages, you might need to set up WebSphere MQ Mapping . See link below for more information on this.
Hope This Helps