After rain delayed the start of the match by two hours, Söderling needed just 67 minutes to dispatch his opponent as he carried over the form he showed in crushing Czech Tomas Berdych in Saturday's semi-final.
The win is Soderling's fourth tournament triumph of the year following victories in Brisbane, Rotterdam and Marseille.
It is also his second Swedish Open crown, having also won in 2009, and the tenth ATP title of his career.
"It went well today. It's absolutely fantastic to be here. I'm already looking forward to next year," the smiling world number five said as he collected his prize.
Ferrer congratulated Söderling, admitting that he "didn't have a chance".
"I'll come back next year and try to win then. Robin has played incredibly well this week. It was a well-deserved victory," the TT news agency quoted him as saying.
Top seed Soderling crushed Ferrer to take the first set in only 30 minutes, and while the Spaniard, seeded two, showed some signs of life in the second set, this was a comfortable win for the home favourite.