No, you can do a sweep instead. Please consult this article concerning the difference between importing a private key and sweeping a wallet.

Sweeping a wallet: 

1. In Coinomi, go to the overview page of the coin you want to "import".

2. Click on .../Sweep Wallet

3. Enter or scan your compartible (BIP38, WIF, or Mini Private Key formats) private key and press next. 

You will be presented with the sweep transaction details in the next page. 

Please consult the article linked above, if you haven't done so already, for questions about the difference between importing and sweeping, and why sweep needs a small transaction fee, which is paid to the miners of each coin's network, and not Coinomi.