After using the Nordic SDK to remove smartBASIC from my module, I decided I would rather use smartBASIC. How do I get the software back?

You will need to upgrade the firmware of your module via the JTAG to restore the soft device area of the memory as well as the programming area. This process will not restore the license key. You will need to email Laird support with the MAC address of the module to have a new license key generated.