Is there any way to import a BIP39 seed to bitcoin core?
No.
As mentioned earlier in this thread:
As far as I know, the BIP39 mnemonic is not working yet on bitcoin core, right?
Correct.
Bitcoin core does not have BIP39 (mnemonic codes) implemented.
While it still creates hierarchical deterministic wallets (BIP32), it does not create a mnemonic code to back it up. The keys have to be backed up by either backing up the master private key or the wallet file.
You might import all the private keys, as mentioned by NotATether.
However, this is not comparable to actually importing and using a BIP39 mnemonic code.