Short answer. Yes, and you do not even need the usufructuary's consent, so long as the easement does not harm the usufruct. Article 689 lets the owner impose without the consent of the usufructuary, any servitudes which will not injure the right of usufruct.
What the law says
The owner of a tenement or piece of land, the usufruct of which belongs to another, may impose thereon, without the consent of the usufructuary, any servitudes which will not injure the right of usufruct.
Civil Code, Article 689 — Easements Over Property Under Usufruct. Read the full provision →
You remain the owner and keep the power to burden the land
A usufruct gives another person the right to use your land and enjoy its fruits, but it does not strip you of ownership. You are still the owner, and ownership carries the power to impose servitudes. Article 689 confirms this directly: the owner of land the usufruct of which belongs to another, may impose thereon, without the consent of the usufructuary, any servitudes, subject to one limit. So the existence of a usufruct over your land does not, by itself, freeze your ability to grant an easement. The law preserves that owner's power even while someone else is enjoying the property.
The one condition: no injury to the usufruct
The power is not unlimited. Article 689 allows only servitudes which will not injure the right of usufruct. The usufructuary's right to use and enjoy the property must be respected, so any easement you grant cannot impair that enjoyment. If the servitude would materially interfere with how the usufructuary uses the land or reduce the benefit he is entitled to draw from it, it falls outside what the article permits without his consent. The rule strikes a balance: you keep the freedom to deal with your property as owner, but not at the expense of the very right you already granted to the usufructuary.
No consent needed within that limit
Notably, the article dispenses with the usufructuary's consent for servitudes that stay within the limit. You do not have to ask permission to burden your own land, provided the easement does not injure the usufruct. This matters in practice, because it means you can, for example, grant a right of way or similar servitude to a neighbour or the public without first securing the usufructuary's agreement, as long as his enjoyment is not harmed. His consent becomes relevant only where the servitude would reach into and prejudice the right he holds.
Practical cautions
Because the dividing line is whether the usufruct is injured, that is where disputes will arise. A servitude that looks harmless to you may, in the usufructuary's eyes, cut into his use or the fruits he expected, and whether it truly injures the usufruct is judged on the facts. It is also worth remembering that the servitude burdens the land itself, so it can outlast the usufruct and continue to affect the property afterward. Granting the easement in a way that plainly leaves the usufructuary's enjoyment intact is the safest path within what Article 689 allows.