If a person has done nikah, will it come under the Special Marriage Act and if he wants to do a second marriage under Hindu Marriage Act, can they do that since the first Muslim wife is not giving him an option for divorce?
Your question lack some basic facts. Are you and your current wife muslim? If your current wife was hindu did she convert to islam before marrying you?Nikah is performed as per muslim personal laws so special marriages act would be out of question if you and your current wife both are muslim.
Also confirm if the new women whom you want to marry is a muslim or converted muslim? Please answer above facts then it can be answered more appropriately.