Hi,
I'm afraid this would require to do modifications in your Joomla template to be able to have the "main" area (where the current component displays itself) moved outside the HTML structure of the template.
Doing the change only for the HikaShop products listing pages is easy.
You can just add such code :
if(@$_REQUEST['option'] == 'com_hikashop' && @$_REQUEST['ctrl'] == 'product' && @$_REQUEST['task'] == 'listing') {
// The page is currently displaying a products listing in the main area of the template
}
The hard part is to place that code in the template code with the correct modifications to adapt the template. I'm afraid you'll have to seek help at your template provider for that.