ICAI conducts a Post-qualification course by the name of DISA. Only qualified Chartered Accountants are eligible for this course.
However, there is another world-renowned system audit course by the name of CISA. A CA final student can enroll to and appear for CISA. For more information on CISA you can refer to www.isaca.org/cisa
yes, you can take up cisa course along with your ca final. however you may be required to produce 5 years of work experience for getting cisa certificate