I think you can find the way how to use the standard SAP connector here
It looks like you just need to use the QlikView SAP connector
as I know there is no free modules.
You can try to connect via OLEDB/ODBC to database directly - it would be for free, but you will not be able to get everything as it is in SAP. As an example try to find BSEG table in DB..
There is an SAP connector (which costs) but we are using Qlik Sense *without* the SAP Connector, but to connect to SAP BW (not the underlying SAP tables).
Have a look at this recent discussion for some pointers which might be enough to get you going; SAP connector for Qliksense