Ministry of Manpower
If you are not applying as a teaching couple, you will be considered for bachelor status. Consequently, your wife / family will not be able to join you for a 6 month period and then this will be at your own cost.
Ministry of Health Minimum Requirements
Before you can be approved you will be given a medical examination by the The Ministry of Health. This includes a chest X-ray and blood tests. The latter specifically looks for HIV and Hepatitis A, B and C. It is in your best interests to ensure that you are medically fit before coming to Oman. Recently we have had applicants who did not know they had certain infections and the MoH and MoM required them to leave the country with immediate effect.