For marriage under special marriage act it is necessary that both parties should not have any subsisting marriage 

you can divorce your first wife and then remarry 

1. It is not clear whether you are Hindu or Muslim and whether your marriage registered under relevant Act r not.

2. if you are Muslim then only you can remarry without divorcing your first wife.

3. if you are Hindu then you can not remarry second time, more so, if your first was registered under Special Marriage Act  without getting a decree of divorce.

It will not be possible since you are hindu and you cannot remarry without divorce to first wife.

See you can remarry if your wife is not objecting as per law second marriage shall not be valid if challenged by first wife and she can after also file a bigamy case.

As you are a hindu and your wife muslim you must have married under the special marriage act. you do not want to divorce her therefore there is no way legally wherein you can marry her.

Regards 

here the consent of the wife is immaterial as the law prohibits you to marry again. It is an offence.

If your fiancée is willing to convert you can marry under provisions of Muslim personal law 

Dear Sir,

Yes, you can marry another girl.  A man does not need approval of his first wife for a second marriage as there is no evidence in the Qur'an or hadith to suggest this. 

That hindu girl should first convert to Islam then it's possible.  Still your wife can object to the same

Well without Divorce you can not marry. 

Hindu man cannot go for bigamy legally. If you wants to marry the second time, you have to divorce first wife. with the consent of  first wife you can do  second marraige but your second marriage never got legal status.

NO.

Without divorce, second marriage is illegal and void.

No. It would be a criminal offence under section 494 of the Indian Penal Code.

Getting remarried during the subsistence of your first marriage is illegal.

Even if your first life gives consent to your second marriage, your second marriage will still be void and illegal.

Even the family members of the the girl can file a complaint against you with the police for the offence of bigamy.

Even though your first wife is a Muslim by religion, your marriage was performed under the provisions of special marriage act only since you both belong to different religions

Therefore you need to dissolve your marriage with that wife.by a decree of divorce through a court of law and you can marry another female after that, notbefore that, it may be considered as bigamy, a crimninal offence.

Whether the first wife is giving her consent or not, any marriage contracted dung the subsistence of an earlier marriage, it will be treated as null and void and also an offence under criminal law.

Dear

You can't remarry without divorcing your first wife as per Hindu Marriage act even if first wife gave consent to you for remarrying as the second marriage will be null and void and also a criminal case of bigamy can registered against you if some one complaint against you.

And there is no possibility for legal second marriage.