Yes, you can certainly win real money while playing slots online. Every time you use actual money to bet on the games, you will also receive real winnings. Moreover, you can even win money by playing online slots with bonuses and extra spins awarded by the casino.
Although there are a lot of people that are saying that you can't win with real money on slots, this is simply not true. In fact, there are quite a few people that have won millions of dollars from playing online slot machines.