[Tiktaalik]

I dunno there's a lot of layers to "sovereignty" some of which FNs have deemed to test and others they have declined to do so.

It's not just land issues. For example in other areas some FNs have wrestled back control over their child services from the Federal government.

But regarding land, it used to be that you could "pre-empt" "Crown Land" and get permission to build a cabin on it and take ownership of it, but that hasn't been a thing for quite a while, likely because the Crown realized that their foundational arguments for owning "Crown land" was pretty shakey.

At the moment FNs in BC largely seem interested in regaining title over their land and regaining a fair degree of power over how it is used.

It's entirely possible for a jurisdiction to have ownership and control over land and to still be within the context and laws of the State called Canada.