Hi Ram, following skills are required to become a Security Auditor:
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Knowledge of current security standards including HIPAA, PCI, SOX, NIST, EU/Safe Harbor, GLBA and FFIEC 
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ISO, ITIL and COBIT frameworks 
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Operating systems including Windows, UNIX, and Linux 
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Database platforms such as MSSQL, Oracle and MySQL 
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C, C++, C#, Java, and PHP programming languages 
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Data analysis software such as ACL or IDEA 
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Network penetration and testing tools including Fidelis, ArcSight, Niksun, Websense, ProofPoint, and BlueCoat 
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Hardware and software firewalls and intrusion detection protocols