Unfortunately, considerably harder. There is a visa category (in Denmark, also, which I'm somewhat more familiar with), but it's not anything close to the almost-a-rubber-stamp process that the pending employment offers category is. Things will go most smoothly if you have venture capital or revenues already, and you want to move the business there.

There is considerable general interest in startups, and people talk about doing something to make it easier to get a visa to start a company. But there are still some roadblocks preventing a more streamlined process. One is that people aren't sure how to judge a legitimate startup, from any random person who claims to be "doing a startup". And there's even some paranoia that your "startup", if not fake, is a real but unsavory business, perhaps some kind of import/export business involving the trade in smokeable plants. Another purely political-coalition-based factor is that the streamlined employment visa categories were pushed through (over some nativist opposition) by big businesses with hiring problems, and so they are narrowly tailored to solve their problem, which is how to get their own new hires into the country with minimal expense/delay.

edit: parent comment was asking about a visa to start a business in Sweden. I think the above might be useful information, so I'm leaving it anyway.