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I have token smart contract that is ERC20 compliant. It is now transferable via any software like MyEtherWallet and similar. I wondering is it possible to forbid token transfer and allow it only using my own site/tool?

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You can create a special account trusted to perform token transfers and customize your smartcontract to reject transfers unless they originate from that trusted account. Your trusted site/tool must have access to unlocked private key of that account to initiate transfers.

To get more inspiration, have a look at https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/ownership/Ownable.sol implementing concept of ownable tokens. It is used by https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/token/ERC20/MintableToken.sol to restrict mint() operation to the owner. You could do the same for transfer operations.

You might also want to study how multi-signature wallets do their job, like https://github.com/gnosis/MultiSigWallet.

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