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According to the Saudi Labor Law, the worker has the right to obtain sick leave, the duration of which is determined by the doctor or hospital.
There is no legal text that obliges the employer to agree to the worker's travel to his country during sick leave.
If the employer refuses to agree to grant the worker sick leave, the worker can file a complaint with the Labor Office against the employer.
Here is the text of the Saudi Labor Law, related to your inquiry:
Article Twenty-Nine:
If any worker sustains a work injury that results in a deficiency in his usual abilities that does not prevent him from performing a job other than his previous job, the employer for whom the worker's injury occurred due to his work must employ him in the appropriate job at the specified wage for that job. This does not prejudice the compensation he is entitled to for his injury.
Article 117: The worker who proves his illness has the right to sick leave with pay for the first thirty days, and with three-quarters of the pay for the following sixty days, and without pay for the thirty days that follow during one year, whether these leaves are continuous or intermittent. One year means: the year that begins from the date of the first sick leave.