Only if you have no choice! you cannot decide i want to do an aveira
and i have a good reason, I mean it for HB”H.
Lishma is a lofty madregah that not most people who think they are doing something lishma makes it actually so.
There are certain circumstances…
However generally NO! You are not allowed to do an aveirah thinking you have a good reason lishma. If there is a certain forced circumstance, then you should ask a shailoh!
To a competent, living, breathing, Posek. Not online!