News that the deal was done came via the club, with the 21-year-old agreeing a four-year contract with his new employers.
In the club release, Sandro said:
"I'm very happy, this is a big step in my career. I know I'm signing for a massive club in England. Everton is the ideal place for me, I've got the ideal manager who is going to keep giving me the confidence to improve my game.
"I cannot wait to wear the blue shirt in front of the Everton fans at Goodison Park. It's a big jump in my career coming to the Premier League and for a club like Everton which is really on the up. They have got big plans and want to succeed and keep developing.
"I'm hoping I can get to know my teammates as soon as possible, and want to adapt to the football and the way of life in the city."
Everton will be delighted to have got this deal over the line, as the acquisition has the potential to be one of the smartest pieces of business done this summer. Per Hunter, Sandro had a £5.2 million release clause in his Malaga contract.
The youngster was let go by Barcelona in the summer of 2016 before being snapped up by the Costa del Sol club. As we can see, he enjoyed quite the campaign at La Rosaleda:
Indeed, it's easy to see why there were high hopes for Sandro at the Camp Nou initially, as he led the line tremendously for Malaga last season.
Although he's not a traditional No. 9, the Spaniard caused so many problems for centre-backs in La Liga when playing through the middle. Sandro's movement is smart, he's a powerful runner, and he's improved in his finishing, netting 14 goals in the top flight last term.
As Squawka Football noted at the end of the previous season, the forward is a threat from distance, too:
For the aforementioned money, Everton have found a real bargain. Sandro may not have made the grade at Barcelona, but he's shown fantastic determination to move to another club and rebuild his career.
Now he has a chance to kick on again with a team where the spotlight will be on him. And as he's set to start a third consecutive season with a different team, it's important the ex-Barca man finds some consistency.
You sense he will get that under Ronald Koeman. Sandro should be a regular in the first team, as he's versatile enough to operate in a variety of different positions across the front line. His work rate, aggression and explosiveness will allow Everton to press further up the pitch, too.
After leaving Barcelona, a lot of La Masia graduates struggle to fulfil their potential elsewhere. Following on from a breakthrough season, this move is the latest sign that Sandro is not going to fall into a similar lull.