According to the Quran it’s not a sin to use the left hand!
The tradition and narrations say that using the left hand is evil and an act of the devil. The Quran doesn‘t agree with this. The terms about left and right in the Quran have no relevance to the hand (al-Balad 90:19; al-Haqqa 69:25; al-Waqia 56:9). According to the Quran it is not important which hand to use, but to eat clean and allowed (halal) things (al-Baqara 2:168), not to waste (al-Isra 17:27) and not to waste and not to be unfair (al-Baqara 2:188). The devil doesn’t care if you use the left hand, but if you make and use ursury/interest then it is an act of the devil (al-Baqara 2:275).
The Quran has given people the choice whether to use the left hand or not.