No. A non-detectable viral load means that you don’t have hepatitis C virus (HCV). Assuming you had HCV at one time, a non-detectable viral load means either you were cured by treatment or you spontaneously cleared hep C on your own. Either way, the virus won’t come back since it isn’t there in the first place.
It is important to know that you can still be reinfected in the future if you are exposed to HCV. Click here for information on how to protect yourself from acquiring hep C.