foreign tourist has to be in group of two or more to travel around in Sikkim..
OP needs no group , in the same way I didnt need it many years back . Even then I got a individual permit from the embassy , and the other angrezi in the jeep got it at the Rangpo checkpost. Since then the permits issued have become longer in two steps , extensions possible in Gangtok , and the national regulations changed "group"from minimum four to two. See sikkimtourism.gov.in , Entry Formalities :
Foreigners must obtain Inner Line Permit (ILP) to visit Sikkim. .. and Rangpo on the strength of an Indian Visa. The 30 days duration Permit is issued on the spot without any delay provided photocopies of the passport and visa along with two pass port photos of the applicants are made available. The permissible duration of the stay for foreign tourists is 30 days initially.
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For those interested in going for trekking in the interior region of the state, the Tourism and Civil Aviation issues Protected Area Permit (PAP) at Gangtok which is available for certain specified area for groups consisting of two or more foreigners subject to condition that the trekking programme is arranged through a registered travel agency.
Trek operators like us ( www.explorehimalaya.org ) can get the permits....
If you need any help with .. you can email us your query at info@...
Near or above the rules against self promotion.