Is there a cure for sickle cell trait?

No: And no cure is needed. With rare exceptions sickle trait has no impact on health and longevity.

Not needed: Sickle cell trait almost never is is associated with any clinical problems more severe than enuresis (bed wetting), so there is no need for a cure. If your question is whether the gene mutation can be reversed so you cannot transmit the condition to your children, the answer is no.

There is no cure: Those with sickle cell trait have both normal hemoglobin (hemoglobin A) and hemoglobin S. This means the person inherited a "defective" gene from one parent and a normal gene from another parent.The defective Hemoglobin S gene creates abnormal hemoglobin and sickle shaped red cells. Unfortunately, there is currently no cure for sickle cell disease or trait (As is the case for most genetic disease)