Yes, there is, but it is not the same as the Christian concept. In Heathenry, a sinful action is any action that breaks frith with one’s group. A group is within its rights to ostracize a frith-breaker. In a less dramatic sense, inaction and stagnancy are also considered morally bad. There can be exceptions, but Heathen ethics is a complex topic, and in-depth discussions of it are outside the scope of this website.