No it is not. There are certain obligations that we need to get done and if they fall on a Sunday we should not feel bad about doing them on that day. But since Sunday is supposed to be a day of rest and a day that we are to keep holy, we should try to do all our obligations (homework, shopping, housework , etc.) during the other 6 days so that when Sunday comes you can actually do as the Church intends for you on that day - to spend some time with God, to make it holier than the other 6 days, spend time some quality time with your family, etc. The only possible sin I can think of is the sin of negligence that happens during one’s week where you use the time you should have been using to do your homework, housework or whatever and now you have to do them on Sunday because you used your time poorly the rest of the week. I would say in this sense there would be at least a venial sin for being careless with your time during the week which caused your Sunday to not be as reserved for rest and prayer.