I am from Sweden and basically everyone here (except some immigrants) speak english very fluently. You would have no issues living in any Nordic country with only English.

I worked at a pretty international company before where there was several individuals whom had lived in Sweden for several years without even bothering to learn the language.

Don't be that guy or gal though, Swedes don't like it when you live here for years without learning anything. Norway is the same, same with Finland and Denmark.

You are welcome, if you ever consider moving I could probably give you some tips of potential employers!