@RupertRussell ...
On the "Modules" index page in a course, it is not possible to limit a given module (or modules) to one or more students...including a group of students. Students either have access to the modules or they don't.
I found an existing Idea here in the Community called:
[Modules] Module access to specific groups, sectio... - Instructure Community - 378353 (canvaslms.co...
As you can see from this Idea, as of today, the status is "In Development". And, it has been added to the larger Theme called:
Enable Differentiated Learning at Scale - Instructure Community - 551400 (canvaslms.com)
I don't know exactly when this will be a part of the core Canvas product, but I'd encourage you to follow the Product Roadmap page so you get an idea of what things are coming down the road for Canvas.
I hope this will help in some way!
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