As others have mentioned, the simple answer is no.
Since the SP01 has a full length steel dustcover that is longer than 3.5" from the slide stop, it must meet all SSP requirements in order to play with it in IDPA. Since magwells are not allowed in SSP, they cannot be used, even for ESP since the SP01 has to meet SSP rules in order to play in ESP. So no magwell for you.
Cutting the dustcover shorter would be considered an external modification but it would probably allow you to install a magwell and use it for ESP but it would be smarter to use a CZ 75 SA frame if you were going to use a magwell.
Trust me, I have had this dillema as well and my solution was to build 2 SP01 Shadows for SSP, and a CTS Longslide and CZ75 Shadow for ESP.
For CDP, I am using a Witness Match Elite in .45 ACP.