Here's an article for poop to read...
https://www.bbc.co.uk/news/uk-politi...endum-35630757

The last two sentences are important...

However, those who want to leave the EU say the only sovereignty that matters is the ability to make all our laws in the UK.

And if that's what sovereignty means, it's difficult to see how it can be achieved while the UK remains part of the EU.