Hi, Stephane. Thanks for your interest in our plugin suite.
I haven’t heard of SportsPress before (and therefore haven’t heard if it conflicts with our plugin).
I’d recommend installing our free/core Event Tickets plugin and it has a post type selector in its settings; see if the free RSVP type tickets work with the SportsPress custom post type(s).
If it does, then you can buy Event Tickets Plus and sell tickets via WooCommerce.
If it doesn’t work, please report that to us so we can have a better understanding of any conflicts with Event Tickets.
Last but not least, we have a pretty great Refund Policy so you can buy one or many of our add-ons and thoroughly test them.
I hope this info helps. Let me know if you have any follow-up questions.