As far as i understand you want to put the payload of the SOAP request into a queue. This could be simply done by the "render-xml()" function in the inputs of a JMS Text Message or using the XML Message Type with your WSDL request message schema in your Queue/Topic Sender.
Your process might be simply look like this:
On the input tab of the JMS Queue sender you need to map the request (here samplerequest) into the Text "body" with the render-xml function. This will "render" your XML tree as text into the JMS message body.
Should look somehow like this:
Hope that helps
Cheers Seb