Does blood sugar levels affect blood alcohol levels?

Depends. If the blood sits around at room temperature and there is microbial contamination, fermentation of glucose could increase alcohol level. However, this is a very long scenario.
The other way. Alcohol acutely will lower blood sugars by inhibiting glucose release from your liver and increasing inulin.

Related Questions

Does high blood sugar affect blood alcohol levels?

No, but. Drinking alcohol will affect blood sugars. For those with diabetes, a transient high blood sugar (because alcohol is sugar) may be followed by low blood sugar later. Read more...