Kim, 40, who plays Jin-Soo Kwon, was arrested Oct. 25 when a police officer spotted him driving erratically in Honolulu. His blood alcohol content was 0.168, more than double the state's legal limit.
District Judge William Cardwell scolded Kim, who wore a dark, gray suit and blue shirt in court Thursday.
"You need to understand that 0.168 is more that double the legal limit. It means you were seriously impaired," Cardwell said. "And it just cannot happen again. It's simply too dangerous."
"Believe me, sir, I do," Kim replied.
Kim also had his driver's license revoked for six months and was subjected to a drug-and-alcohol assessment. He was also ordered to pay $212 in court fees and perform 72 hours of community service.
"I'm just grateful and relieved that this matter has been resolved," he said after the hearing. "It's been a pretty difficult time for my family and me. But I'm glad I had a chance to take responsibility for my mistake."
Kim was the third "Lost" actor to have been arrested for driving while intoxicated in Hawaii; the other two had their characters killed off on the show soon afterward. The roles of Michelle Rodriguez and Cynthia Watros were eliminated in 2005 after they pleaded guilty to drunken driving.