Technically speaking, no they can't own the land but foreigners or non-Filipino nationals may however purchase condominiums, buildings, and enter into a long term land lease. Like I said all legal terms are arranged properly with the talks of the buyer, land owner and a legal person in-charge. Yes, more hassle but those terms are discussed properly to protect non Filipino citizen. We are talking big money here. There is no dumb person that will accept the terms that see it's is unfavorable to all parties. Foreigner buyer will face protection here. If one is interested rather than discussing it here as Im not the owner, they can shoot me a PM and all talks will be arranged quickly so they can talk freely to the owner itself who are in business in real estate for a long time.
* - listed legal terms
Just take note that this is only applied for the foreigners. To all interested Filipino, process will be done quickly as long as both parties arrange the deal properly.