The order of new posting for Sinha, a 1979 batch IPS officer of Tripura cadre, came late last week while he was on leave for nearly a month since Sharma was appointed the IB Director.
According to an unwritten rule, if an Intelligence Bureau official from a particular batch is appointed as Director, the others from the same batch or senior are posted out of the agency.
Sinha is due to retire in June this year while Prasad will retire in January next year.
Sharma will have a fixed tenure of two years and will retire in December-end of 2016.
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In another order, senior IPS officer K Durga Prasad, who was shunted out unceremoniously as the chief of elite Special Protection Group (SPG) in November last, has been appointed as Special Director General of world's largest CRPF force.
The 1981-batch IPS officer from Andhra Pradesh was unceremoniously relieved as SPG Director on November 28 when he was accompanying Prime Minister Narendra Modi on his visit to Kathmandu for SAARC summit in November.
Prasad was appointed as SPG Director in 2011 for a period of two years, which was extended by one more year in 2013 up to November 1, 2014. However, there was no order from November 2 to 28.