Where can I apply for divorce in Sharjah

You can register the divorce Lawsuit by any party in the Family Guidance section of one of the Emirates. Where the coordination between the parties and scheduling a meeting with the family counselor.
Interviewing the family counselor is mandatory for divorce proceedings in the UAE. Couples are allowed to express their concerns about marriage in the absence of their legal representative.
Friendly divorce can be reached at this stage. The parties shall formulate and sign a settlement based on mutual understanding between the parties before the family directive
If one or both of the parties insists on a divorce, the family counselor submits a referral letter to allow them to appear before the court to conclude the divorce case.
The letter may be submitted to the Court at any time within three months from the date of issue. Divorce proceedings are conducted at the discretion of the court and each party shall provide evidence in its possession against the other party in addition to each party's defense of itself.

If this is proven in court, divorce can also be obtained and the custody of the child obtained

Show this matter to the judiciary, and it remains the judge’s option to accept or reject this evidence