KSA first investigated Winning Poker Network in September last year and found that the operator had illegally been offering games of chance.
After being contacted by the regulator, Winning Poker Network said that it would halt these activities.
However, following a further check by KSA, while the original Winning Poker Network site was no longer accessible from the Netherlands, it was possible for Dutch players to create an account on another website run by the operator.
As such, KSA said consumers in the Netherlands could use these accounts to play games of chance illegally with Winning Poker Network.
The regulator ruled that as the offering of illegal games of chance had not been completely stopped, it issued the cease-and-desist order, subject to periodic penalty payments.
Should the breach continue, Winning Poker Network will be required to make a weekly payment of €25,000 (£21,954/$26,914) for each week it offers illegal games of chance, up to a maximum of €75,000.
KSA added that it would continue to check on the operator to assess further breaches.