This sounds like as convenient a measure to take against Pyongyang as possible – put the DPRK in the penalty box.
…either ban broadcasts of the 2010 World Cup tournament in North Korea, or even better, ban North Korea’s side from participation in the tournament due to start next month. There is precedent for this: Yugoslavia was barred from participating in the 1994 World Cup because of ongoing United Nations sanctions. It’s also a sanction that would not benefit any internal hardliners responsible for the Cheonan.